264397631 has 2 divisors, whose sum is σ = 264397632. Its totient is φ = 264397630.

The previous prime is 264397619. The next prime is 264397687. The reversal of 264397631 is 136793462.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 264397631 - 2¹⁰ = 264396607 is a prime.

It is a super-2 number, since 2×264397631² = 139812214556824322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264397531) 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, 132198815 + 132198816.

It is an arithmetic number, because the mean of its divisors is an integer number (132198816).

Almost surely, 2^264397631 is an apocalyptic number.

264397631 is a deficient number, since it is larger than the sum of its proper divisors (1).

264397631 is an equidigital number, since it uses as much as digits as its factorization.

264397631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 41.

The square root of 264397631 is about 16260.3084534089. The cubic root of 264397631 is about 641.8287789498.

The spelling of 264397631 in words is "two hundred sixty-four million, three hundred ninety-seven thousand, six hundred thirty-one".