621495943 has 2 divisors, whose sum is σ = 621495944. Its totient is φ = 621495942.

The previous prime is 621495913. The next prime is 621495977. The reversal of 621495943 is 349594126.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 621495943 - 2²⁵ = 587941511 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 621495943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621495913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310747971 + 310747972.

It is an arithmetic number, because the mean of its divisors is an integer number (310747972).

Almost surely, 2^621495943 is an apocalyptic number.

621495943 is a deficient number, since it is larger than the sum of its proper divisors (1).

621495943 is an equidigital number, since it uses as much as digits as its factorization.

621495943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 43.

The square root of 621495943 is about 24929.8203563523. The cubic root of 621495943 is about 853.3871504178.

The spelling of 621495943 in words is "six hundred twenty-one million, four hundred ninety-five thousand, nine hundred forty-three".