621422591 has 2 divisors, whose sum is σ = 621422592. Its totient is φ = 621422590.

The previous prime is 621422563. The next prime is 621422603. The reversal of 621422591 is 195224126.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 621422591 - 2¹⁸ = 621160447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621422551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310711295 + 310711296.

It is an arithmetic number, because the mean of its divisors is an integer number (310711296).

Almost surely, 2^621422591 is an apocalyptic number.

621422591 is a deficient number, since it is larger than the sum of its proper divisors (1).

621422591 is an equidigital number, since it uses as much as digits as its factorization.

621422591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 32.

The square root of 621422591 is about 24928.3491430941. The cubic root of 621422591 is about 853.3535754510.

The spelling of 621422591 in words is "six hundred twenty-one million, four hundred twenty-two thousand, five hundred ninety-one".