623426591 has 2 divisors, whose sum is σ = 623426592. Its totient is φ = 623426590.

The previous prime is 623426581. The next prime is 623426597. The reversal of 623426591 is 195624326.

623426591 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 a de Polignac number, because none of the positive numbers 2^k-623426591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (623426597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311713295 + 311713296.

It is an arithmetic number, because the mean of its divisors is an integer number (311713296).

Almost surely, 2^623426591 is an apocalyptic number.

623426591 is a deficient number, since it is larger than the sum of its proper divisors (1).

623426591 is an equidigital number, since it uses as much as digits as its factorization.

623426591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 38.

The square root of 623426591 is about 24968.5119901047. The cubic root of 623426591 is about 854.2699060218.

The spelling of 623426591 in words is "six hundred twenty-three million, four hundred twenty-six thousand, five hundred ninety-one".