155597172 has 12 divisors (see below), whose sum is σ = 363060096. Its totient is φ = 51865720.

The previous prime is 155597161. The next prime is 155597191. The reversal of 155597172 is 271795551.

It is a tau number, because it is divible by the number of its divisors (12).

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 3 ways as a sum of consecutive naturals, for example, 6483204 + ... + 6483227.

It is an arithmetic number, because the mean of its divisors is an integer number (30255008).

Almost surely, 2^155597172 is an apocalyptic number.

155597172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

155597172 is an abundant number, since it is smaller than the sum of its proper divisors (207462924).

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

155597172 is a wasteful number, since it uses less digits than its factorization.

155597172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12966438 (or 12966436 counting only the distinct ones).

The product of its digits is 110250, while the sum is 42.

The square root of 155597172 is about 12473.8595470688. The cubic root of 155597172 is about 537.8575052296.

The spelling of 155597172 in words is "one hundred fifty-five million, five hundred ninety-seven thousand, one hundred seventy-two".