161225904 has 40 divisors (see below), whose sum is σ = 476001280. Its totient is φ = 46064448.

The previous prime is 161225879. The next prime is 161225921. The reversal of 161225904 is 409522161.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239584 + ... + 240255.

It is an arithmetic number, because the mean of its divisors is an integer number (11900032).

Almost surely, 2^161225904 is an apocalyptic number.

161225904 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

161225904 is an abundant number, since it is smaller than the sum of its proper divisors (314775376).

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

161225904 is a wasteful number, since it uses less digits than its factorization.

161225904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479857 (or 479851 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 161225904 is about 12697.4762846796. The cubic root of 161225904 is about 544.2665036467.

The spelling of 161225904 in words is "one hundred sixty-one million, two hundred twenty-five thousand, nine hundred four".