216361631 has 2 divisors, whose sum is σ = 216361632. Its totient is φ = 216361630.

The previous prime is 216361609. The next prime is 216361657. The reversal of 216361631 is 136163612.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216361631 - 2¹⁸ = 216099487 is a prime.

It is a super-2 number, since 2×216361631² = 93624710737960322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 216361594 and 216361603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216361231) 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, 108180815 + 108180816.

It is an arithmetic number, because the mean of its divisors is an integer number (108180816).

Almost surely, 2^216361631 is an apocalyptic number.

216361631 is a deficient number, since it is larger than the sum of its proper divisors (1).

216361631 is an equidigital number, since it uses as much as digits as its factorization.

216361631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 29.

The square root of 216361631 is about 14709.2362480178. The cubic root of 216361631 is about 600.3346568252.

The spelling of 216361631 in words is "two hundred sixteen million, three hundred sixty-one thousand, six hundred thirty-one".