215698131 has 24 divisors (see below), whose sum is σ = 340352064. Its totient is φ = 130547760.

The previous prime is 215698111. The next prime is 215698139. The reversal of 215698131 is 131896512.

It is not a de Polignac number, because 215698131 - 2¹⁴ = 215681747 is a prime.

It is a super-2 number, since 2×215698131² = 93051367433786322, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (215698139) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 128560 + ... + 130226.

It is an arithmetic number, because the mean of its divisors is an integer number (14181336).

Almost surely, 2^215698131 is an apocalyptic number.

215698131 is a deficient number, since it is larger than the sum of its proper divisors (124653933).

215698131 is a wasteful number, since it uses less digits than its factorization.

215698131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2991 (or 2988 counting only the distinct ones).

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

The square root of 215698131 is about 14686.6650741412. The cubic root of 215698131 is about 599.7203613573.

The spelling of 215698131 in words is "two hundred fifteen million, six hundred ninety-eight thousand, one hundred thirty-one".