623456513 has 2 divisors, whose sum is σ = 623456514. Its totient is φ = 623456512.

The previous prime is 623456489. The next prime is 623456563. The reversal of 623456513 is 315654326.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 567011344 + 56445169 = 23812^2 + 7513^2 .

It is a cyclic number.

It is not a de Polignac number, because 623456513 - 2²⁸ = 355021057 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (623456563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311728256 + 311728257.

It is an arithmetic number, because the mean of its divisors is an integer number (311728257).

Almost surely, 2^623456513 is an apocalyptic number.

It is an amenable number.

623456513 is a deficient number, since it is larger than the sum of its proper divisors (1).

623456513 is an equidigital number, since it uses as much as digits as its factorization.

623456513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 35.

The square root of 623456513 is about 24969.1111776130. Note that the first 4 decimals coincide. The cubic root of 623456513 is about 854.2835729905.

The spelling of 623456513 in words is "six hundred twenty-three million, four hundred fifty-six thousand, five hundred thirteen".