158531172 has 12 divisors (see below), whose sum is σ = 369906096. Its totient is φ = 52843720.

The previous prime is 158531167. The next prime is 158531183. The reversal of 158531172 is 271135851.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6605454 + ... + 6605477.

It is an arithmetic number, because the mean of its divisors is an integer number (30825508).

Almost surely, 2^158531172 is an apocalyptic number.

158531172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

158531172 is an abundant number, since it is smaller than the sum of its proper divisors (211374924).

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

158531172 is a wasteful number, since it uses less digits than its factorization.

158531172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13210938 (or 13210936 counting only the distinct ones).

The product of its digits is 8400, while the sum is 33.

The square root of 158531172 is about 12590.9162494236. The cubic root of 158531172 is about 541.2171584452.

The spelling of 158531172 in words is "one hundred fifty-eight million, five hundred thirty-one thousand, one hundred seventy-two".