623538913 has 2 divisors, whose sum is σ = 623538914. Its totient is φ = 623538912.

The previous prime is 623538841. The next prime is 623538931. The reversal of 623538913 is 319835326.

Together with next prime (623538931) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 374151649 + 249387264 = 19343^2 + 15792^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-623538913 is a prime.

It is not a weakly prime, because it can be changed into another prime (623538973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311769456 + 311769457.

It is an arithmetic number, because the mean of its divisors is an integer number (311769457).

Almost surely, 2^623538913 is an apocalyptic number.

It is an amenable number.

623538913 is a deficient number, since it is larger than the sum of its proper divisors (1).

623538913 is an equidigital number, since it uses as much as digits as its factorization.

623538913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 40.

The square root of 623538913 is about 24970.7611618068. The cubic root of 623538913 is about 854.3212071927.

The spelling of 623538913 in words is "six hundred twenty-three million, five hundred thirty-eight thousand, nine hundred thirteen".