156139881 has 8 divisors (see below), whose sum is σ = 208391040. Its totient is φ = 103990992.

The previous prime is 156139877. The next prime is 156139903. The reversal of 156139881 is 188931651.

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

It is not a de Polignac number, because 156139881 - 2² = 156139877 is a prime.

It is a super-2 number, since 2×156139881² = 48759324877388322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (156139861) 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, 21930 + ... + 28163.

It is an arithmetic number, because the mean of its divisors is an integer number (26048880).

Almost surely, 2^156139881 is an apocalyptic number.

It is an amenable number.

156139881 is a deficient number, since it is larger than the sum of its proper divisors (52251159).

156139881 is a wasteful number, since it uses less digits than its factorization.

156139881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51135.

The product of its digits is 51840, while the sum is 42.

The square root of 156139881 is about 12495.5944636500. The cubic root of 156139881 is about 538.4821125352.

The spelling of 156139881 in words is "one hundred fifty-six million, one hundred thirty-nine thousand, eight hundred eighty-one".