216495931 has 2 divisors, whose sum is σ = 216495932. Its totient is φ = 216495930.

The previous prime is 216495919. The next prime is 216495943. The reversal of 216495931 is 139594612.

It is a balanced prime because it is at equal distance from previous prime (216495919) and next prime (216495943).

It is a cyclic number.

It is not a de Polignac number, because 216495931 - 2¹¹ = 216493883 is a prime.

It is a super-2 number, since 2×216495931² = 93740976279113522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (216495031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108247965 + 108247966.

It is an arithmetic number, because the mean of its divisors is an integer number (108247966).

Almost surely, 2^216495931 is an apocalyptic number.

216495931 is a deficient number, since it is larger than the sum of its proper divisors (1).

216495931 is an equidigital number, since it uses as much as digits as its factorization.

216495931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 40.

The square root of 216495931 is about 14713.8006986638. The cubic root of 216495931 is about 600.4588443840.

The spelling of 216495931 in words is "two hundred sixteen million, four hundred ninety-five thousand, nine hundred thirty-one".