161259520 has 112 divisors (see below), whose sum is σ = 402628608. Its totient is φ = 61931520.

The previous prime is 161259499. The next prime is 161259521. The reversal of 161259520 is 25952161.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (161259521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1269697 + ... + 1269823.

Almost surely, 2^161259520 is an apocalyptic number.

161259520 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 161259520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201314304).

161259520 is an abundant number, since it is smaller than the sum of its proper divisors (241369088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161259520 is an equidigital number, since it uses as much as digits as its factorization.

161259520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 161259520 is about 12698.7999433017. The cubic root of 161259520 is about 544.3043279890.

The spelling of 161259520 in words is "one hundred sixty-one million, two hundred fifty-nine thousand, five hundred twenty".