216632957 has 2 divisors, whose sum is σ = 216632958. Its totient is φ = 216632956.

The previous prime is 216632953. The next prime is 216633007. The reversal of 216632957 is 759236612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182223001 + 34409956 = 13499^2 + 5866^2 .

It is a cyclic number.

It is not a de Polignac number, because 216632957 - 2² = 216632953 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216632951) 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, 108316478 + 108316479.

It is an arithmetic number, because the mean of its divisors is an integer number (108316479).

Almost surely, 2^216632957 is an apocalyptic number.

It is an amenable number.

216632957 is a deficient number, since it is larger than the sum of its proper divisors (1).

216632957 is an equidigital number, since it uses as much as digits as its factorization.

216632957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 41.

The square root of 216632957 is about 14718.4563388964. The cubic root of 216632957 is about 600.5854997605.

The spelling of 216632957 in words is "two hundred sixteen million, six hundred thirty-two thousand, nine hundred fifty-seven".