216324631 has 2 divisors, whose sum is σ = 216324632. Its totient is φ = 216324630.

The previous prime is 216324553. The next prime is 216324649. The reversal of 216324631 is 136423612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216324631 - 2¹³ = 216316439 is a prime.

It is a super-2 number, since 2×216324631² = 93592691954572322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216324631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216334631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108162315 + 108162316.

It is an arithmetic number, because the mean of its divisors is an integer number (108162316).

Almost surely, 2^216324631 is an apocalyptic number.

216324631 is a deficient number, since it is larger than the sum of its proper divisors (1).

216324631 is an equidigital number, since it uses as much as digits as its factorization.

216324631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 28.

The square root of 216324631 is about 14707.9784810830. The cubic root of 216324631 is about 600.3004338000.

The spelling of 216324631 in words is "two hundred sixteen million, three hundred twenty-four thousand, six hundred thirty-one".