215968131 has 12 divisors (see below), whose sum is σ = 314817360. Its totient is φ = 142657200.

The previous prime is 215968111. The next prime is 215968147. The reversal of 215968131 is 131869512.

It is not a de Polignac number, because 215968131 - 2⁵ = 215968099 is a prime.

It is a super-2 number, since 2×215968131² = 93284467215266322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (215968111) 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, 109095 + ... + 111056.

It is an arithmetic number, because the mean of its divisors is an integer number (26234780).

Almost surely, 2^215968131 is an apocalyptic number.

215968131 is a deficient number, since it is larger than the sum of its proper divisors (98849229).

215968131 is a wasteful number, since it uses less digits than its factorization.

215968131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220266 (or 220263 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 215968131 is about 14695.8542113074. The cubic root of 215968131 is about 599.9704902153.

The spelling of 215968131 in words is "two hundred fifteen million, nine hundred sixty-eight thousand, one hundred thirty-one".