215332631 has 2 divisors, whose sum is σ = 215332632. Its totient is φ = 215332630.

The previous prime is 215332619. The next prime is 215332633. The reversal of 215332631 is 136233512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215332631 - 2¹⁸ = 215070487 is a prime.

It is a super-2 number, since 2×215332631² = 92736283946764322, which contains 22 as substring.

Together with 215332633, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 215332631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215332633) 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, 107666315 + 107666316.

It is an arithmetic number, because the mean of its divisors is an integer number (107666316).

Almost surely, 2^215332631 is an apocalyptic number.

215332631 is a deficient number, since it is larger than the sum of its proper divisors (1).

215332631 is an equidigital number, since it uses as much as digits as its factorization.

215332631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 26.

The square root of 215332631 is about 14674.2165378599. The cubic root of 215332631 is about 599.3814282415.

The spelling of 215332631 in words is "two hundred fifteen million, three hundred thirty-two thousand, six hundred thirty-one".