| Base | Representation |
|---|---|
| bin | 10011010000100… |
| … | …10101011010000 |
| 3 | 102020222221211000 |
| 4 | 21220102223100 |
| 5 | 312324312300 |
| 6 | 24010422000 |
| 7 | 4001133150 |
| oct | 1150225320 |
| 9 | 366887730 |
| 10 | 161557200 |
| 11 | 83216352 |
| 12 | 46131900 |
| 13 | 2761749c |
| 14 | 17656760 |
| 15 | e2b3c00 |
| hex | 9a12ad0 |
161557200 has 240 divisors, whose sum is σ = 657477760. Its totient is φ = 36910080.
The previous prime is 161557183. The next prime is 161557217. The reversal of 161557200 is 2755161.
It is an interprime number because it is at equal distance from previous prime (161557183) and next prime (161557217).
It is a tau number, because it is divible by the number of its divisors (240).
It is a super-2 number, since 2×1615572002 = 52201457743680000, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (27).
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 74532 + ... + 76668.
Almost surely, 2161557200 is an apocalyptic number.
161557200 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 161557200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (328738880).
161557200 is an abundant number, since it is smaller than the sum of its proper divisors (495920560).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
161557200 is a wasteful number, since it uses less digits than its factorization.
161557200 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2171 (or 2154 counting only the distinct ones).
The product of its (nonzero) digits is 2100, while the sum is 27.
The square root of 161557200 is about 12710.5153318030. The cubic root of 161557200 is about 544.6390450022.
Adding to 161557200 its product of nonzero digits (2100), we get a triangular number (161559300 = T17975).
The spelling of 161557200 in words is "one hundred sixty-one million, five hundred fifty-seven thousand, two hundred".
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