161297520 has 40 divisors (see below), whose sum is σ = 500023056. Its totient is φ = 43012608.

The previous prime is 161297501. The next prime is 161297531. The reversal of 161297520 is 25792161.

161297520 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 335797 + ... + 336276.

Almost surely, 2^161297520 is an apocalyptic number.

161297520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161297520 is an abundant number, since it is smaller than the sum of its proper divisors (338725536).

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

161297520 is a wasteful number, since it uses less digits than its factorization.

161297520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672089 (or 672083 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 161297520 is about 12700.2960595413. The cubic root of 161297520 is about 544.3470788294.

The spelling of 161297520 in words is "one hundred sixty-one million, two hundred ninety-seven thousand, five hundred twenty".