172157881 has 8 divisors (see below), whose sum is σ = 196862400. Its totient is φ = 147481008.

The previous prime is 172157809. The next prime is 172157897. The reversal of 172157881 is 188751271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172157881 - 2¹¹ = 172155833 is a prime.

It is a super-2 number, since 2×172157881² = 59276671980820322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (172157581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8835 + ... + 20551.

It is an arithmetic number, because the mean of its divisors is an integer number (24607800).

Almost surely, 2^172157881 is an apocalyptic number.

It is an amenable number.

172157881 is a deficient number, since it is larger than the sum of its proper divisors (24704519).

172157881 is a wasteful number, since it uses less digits than its factorization.

172157881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13823.

The product of its digits is 31360, while the sum is 40.

The square root of 172157881 is about 13120.8948246680. The cubic root of 172157881 is about 556.2998841599.

The spelling of 172157881 in words is "one hundred seventy-two million, one hundred fifty-seven thousand, eight hundred eighty-one".