648672631 has 2 divisors, whose sum is σ = 648672632. Its totient is φ = 648672630.

The previous prime is 648672623. The next prime is 648672637. The reversal of 648672631 is 136276846.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 648672631 - 2³ = 648672623 is a prime.

It is a super-2 number, since 2×648672631² = 841552364416924322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648672637) 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, 324336315 + 324336316.

It is an arithmetic number, because the mean of its divisors is an integer number (324336316).

Almost surely, 2^648672631 is an apocalyptic number.

648672631 is a deficient number, since it is larger than the sum of its proper divisors (1).

648672631 is an equidigital number, since it uses as much as digits as its factorization.

648672631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 43.

The square root of 648672631 is about 25469.0524166095. The cubic root of 648672631 is about 865.6490527725.

The spelling of 648672631 in words is "six hundred forty-eight million, six hundred seventy-two thousand, six hundred thirty-one".