161575904 has 24 divisors (see below), whose sum is σ = 363546288. Its totient is φ = 69246720.

The previous prime is 161575901. The next prime is 161575919. The reversal of 161575904 is 409575161.

It is a super-2 number, since 2×161575904² = 52213545506834432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161575901) 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 3 ways as a sum of consecutive naturals, for example, 360437 + ... + 360884.

It is an arithmetic number, because the mean of its divisors is an integer number (15147762).

Almost surely, 2^161575904 is an apocalyptic number.

161575904 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

161575904 is an abundant number, since it is smaller than the sum of its proper divisors (201970384).

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

161575904 is an equidigital number, since it uses as much as digits as its factorization.

161575904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721338 (or 721330 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 161575904 is about 12711.2510792605. The cubic root of 161575904 is about 544.6600623995.

The spelling of 161575904 in words is "one hundred sixty-one million, five hundred seventy-five thousand, nine hundred four".