157213881 has 12 divisors (see below), whose sum is σ = 247731120. Its totient is φ = 95281080.

The previous prime is 157213879. The next prime is 157213907. The reversal of 157213881 is 188312751.

157213881 is a `hidden beast` number, since 1 + 572 + 1 + 3 + 8 + 81 = 666.

It is not a de Polignac number, because 157213881 - 2¹ = 157213879 is a prime.

It is a super-2 number, since 2×157213881² = 49432408758164322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (157213831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 793911 + ... + 794108.

It is an arithmetic number, because the mean of its divisors is an integer number (20644260).

Almost surely, 2^157213881 is an apocalyptic number.

157213881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

157213881 is a deficient number, since it is larger than the sum of its proper divisors (90517239).

157213881 is a wasteful number, since it uses less digits than its factorization.

157213881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1588036 (or 1588033 counting only the distinct ones).

The product of its digits is 13440, while the sum is 36.

The square root of 157213881 is about 12538.4959624350. The cubic root of 157213881 is about 539.7139328437.

The spelling of 157213881 in words is "one hundred fifty-seven million, two hundred thirteen thousand, eight hundred eighty-one".