215088631 has 2 divisors, whose sum is σ = 215088632. Its totient is φ = 215088630.

The previous prime is 215088589. The next prime is 215088637. The reversal of 215088631 is 136880512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215088631 - 2¹¹ = 215086583 is a prime.

It is a super-2 number, since 2×215088631² = 92526238370908322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215088637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107544315 + 107544316.

It is an arithmetic number, because the mean of its divisors is an integer number (107544316).

Almost surely, 2^215088631 is an apocalyptic number.

215088631 is a deficient number, since it is larger than the sum of its proper divisors (1).

215088631 is an equidigital number, since it uses as much as digits as its factorization.

215088631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 215088631 is about 14665.9002792191. The cubic root of 215088631 is about 599.1549501916.

The spelling of 215088631 in words is "two hundred fifteen million, eighty-eight thousand, six hundred thirty-one".