648436931 has 2 divisors, whose sum is σ = 648436932. Its totient is φ = 648436930.

The previous prime is 648436891. The next prime is 648436969. The reversal of 648436931 is 139634846.

648436931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 648436931 - 2¹⁴ = 648420547 is a prime.

It is a super-2 number, since 2×648436931² = 840940906969397522, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (648436991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324218465 + 324218466.

It is an arithmetic number, because the mean of its divisors is an integer number (324218466).

Almost surely, 2^648436931 is an apocalyptic number.

648436931 is a deficient number, since it is larger than the sum of its proper divisors (1).

648436931 is an equidigital number, since it uses as much as digits as its factorization.

648436931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 44.

The square root of 648436931 is about 25464.4248118822. The cubic root of 648436931 is about 865.5441934083.

The spelling of 648436931 in words is "six hundred forty-eight million, four hundred thirty-six thousand, nine hundred thirty-one".