651312631 has 2 divisors, whose sum is σ = 651312632. Its totient is φ = 651312630.

The previous prime is 651312617. The next prime is 651312671. The reversal of 651312631 is 136213156.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 651312631 - 2⁷ = 651312503 is a prime.

It is a super-2 number, since 2×651312631² = 848416286600284322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 651312631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (651312671) 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, 325656315 + 325656316.

It is an arithmetic number, because the mean of its divisors is an integer number (325656316).

Almost surely, 2^651312631 is an apocalyptic number.

651312631 is a deficient number, since it is larger than the sum of its proper divisors (1).

651312631 is an equidigital number, since it uses as much as digits as its factorization.

651312631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 28.

The square root of 651312631 is about 25520.8273964619. The cubic root of 651312631 is about 866.8218170130.

Adding to 651312631 its reverse (136213156), we get a palindrome (787525787).

The spelling of 651312631 in words is "six hundred fifty-one million, three hundred twelve thousand, six hundred thirty-one".