215252631 has 12 divisors (see below), whose sum is σ = 339186120. Its totient is φ = 130456080.

The previous prime is 215252629. The next prime is 215252633. The reversal of 215252631 is 136252512.

It is a happy number.

215252631 is a `hidden beast` number, since 2 + 1 + 5 + 25 + 2 + 631 = 666.

It is an interprime number because it is at equal distance from previous prime (215252629) and next prime (215252633).

It is not a de Polignac number, because 215252631 - 2¹ = 215252629 is a prime.

It is a super-2 number, since 2×215252631² = 92667390304844322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 215252595 and 215252604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215252633) 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 in 11 ways as a sum of consecutive naturals, for example, 1087036 + ... + 1087233.

It is an arithmetic number, because the mean of its divisors is an integer number (28265510).

Almost surely, 2^215252631 is an apocalyptic number.

215252631 is a deficient number, since it is larger than the sum of its proper divisors (123933489).

215252631 is a wasteful number, since it uses less digits than its factorization.

215252631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2174286 (or 2174283 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 215252631 is about 14671.4904150874. The cubic root of 215252631 is about 599.3071920030.

The spelling of 215252631 in words is "two hundred fifteen million, two hundred fifty-two thousand, six hundred thirty-one".