| Base | Representation |
|---|---|
| bin | 10011001101000… |
| … | …11011011001000 |
| 3 | 102020010210201200 |
| 4 | 21212203123020 |
| 5 | 312220222022 |
| 6 | 23552544200 |
| 7 | 3664224465 |
| oct | 1146433310 |
| 9 | 366123650 |
| 10 | 161101512 |
| 11 | 82a34a50 |
| 12 | 45b52060 |
| 13 | 274b7c50 |
| 14 | 1757866c |
| 15 | e223bac |
| hex | 99a36c8 |
161101512 has 96 divisors (see below), whose sum is σ = 512628480. Its totient is φ = 45060480.
The previous prime is 161101489. The next prime is 161101517. The reversal of 161101512 is 215101161.
It is a happy number.
161101512 is a `hidden beast` number, since 1 + 611 + 0 + 1 + 51 + 2 = 666.
It is a super-2 number, since 2×1611015122 = 51907394337372288, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (161101517) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2473 + ... + 18119.
It is an arithmetic number, because the mean of its divisors is an integer number (5339880).
Almost surely, 2161101512 is an apocalyptic number.
161101512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 161101512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (256314240).
161101512 is an abundant number, since it is smaller than the sum of its proper divisors (351526968).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
161101512 is a wasteful number, since it uses less digits than its factorization.
161101512 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 15683 (or 15676 counting only the distinct ones).
The product of its (nonzero) digits is 60, while the sum is 18.
The square root of 161101512 is about 12692.5770432958. The cubic root of 161101512 is about 544.1264934367.
Adding to 161101512 its reverse (215101161), we get a palindrome (376202673).
The spelling of 161101512 in words is "one hundred sixty-one million, one hundred one thousand, five hundred twelve".
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