| Base | Representation |
|---|---|
| bin | 10011001101010… |
| … | …11101110100000 |
| 3 | 102020012112101020 |
| 4 | 21212223232200 |
| 5 | 312222314040 |
| 6 | 23553405440 |
| 7 | 3664425600 |
| oct | 1146535640 |
| 9 | 366175336 |
| 10 | 161135520 |
| 11 | 82a58557 |
| 12 | 45b69880 |
| 13 | 274ca580 |
| 14 | 17586c00 |
| 15 | e22dcd0 |
| hex | 99abba0 |
161135520 has 576 divisors, whose sum is σ = 694987776. Its totient is φ = 30965760.
The previous prime is 161135519. The next prime is 161135521. The reversal of 161135520 is 25531161.
161135520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is an interprime number because it is at equal distance from previous prime (161135519) and next prime (161135521).
It is a Harshad number since it is a multiple of its sum of digits (24).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (161135521) by changing a digit.
It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5197905 + ... + 5197935.
It is an arithmetic number, because the mean of its divisors is an integer number (1206576).
Almost surely, 2161135520 is an apocalyptic number.
161135520 is a gapful number since it is divisible by the number (10) 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 161135520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (347493888).
161135520 is an abundant number, since it is smaller than the sum of its proper divisors (533852256).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
161135520 is a wasteful number, since it uses less digits than its factorization.
161135520 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 93 (or 78 counting only the distinct ones).
The product of its (nonzero) digits is 900, while the sum is 24.
The square root of 161135520 is about 12693.9166532635. The cubic root of 161135520 is about 544.1647785146.
Adding to 161135520 its reverse (25531161), we get a palindrome (186666681).
The spelling of 161135520 in words is "one hundred sixty-one million, one hundred thirty-five thousand, five hundred twenty".
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