215693131 has 2 divisors, whose sum is σ = 215693132. Its totient is φ = 215693130.

The previous prime is 215693129. The next prime is 215693209. The reversal of 215693131 is 131396512.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215693131 - 2¹ = 215693129 is a prime.

It is a super-2 number, since 2×215693131² = 93047053521166322, which contains 22 as substring.

Together with 215693129, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 215693093 and 215693102.

It is not a weakly prime, because it can be changed into another prime (215663131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107846565 + 107846566.

It is an arithmetic number, because the mean of its divisors is an integer number (107846566).

Almost surely, 2^215693131 is an apocalyptic number.

215693131 is a deficient number, since it is larger than the sum of its proper divisors (1).

215693131 is an equidigital number, since it uses as much as digits as its factorization.

215693131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4860, while the sum is 31.

The square root of 215693131 is about 14686.4948507123. The cubic root of 215693131 is about 599.7157273734.

The spelling of 215693131 in words is "two hundred fifteen million, six hundred ninety-three thousand, one hundred thirty-one".