621495913 has 2 divisors, whose sum is σ = 621495914. Its totient is φ = 621495912.

The previous prime is 621495881. The next prime is 621495943. The reversal of 621495913 is 319594126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 577777369 + 43718544 = 24037^2 + 6612^2 .

It is a cyclic number.

It is not a de Polignac number, because 621495913 - 2⁵ = 621495881 is a prime.

It is not a weakly prime, because it can be changed into another prime (621495943) 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, 310747956 + 310747957.

It is an arithmetic number, because the mean of its divisors is an integer number (310747957).

Almost surely, 2^621495913 is an apocalyptic number.

It is an amenable number.

621495913 is a deficient number, since it is larger than the sum of its proper divisors (1).

621495913 is an equidigital number, since it uses as much as digits as its factorization.

621495913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 40.

The square root of 621495913 is about 24929.8197546633. The cubic root of 621495913 is about 853.3871366867.

The spelling of 621495913 in words is "six hundred twenty-one million, four hundred ninety-five thousand, nine hundred thirteen".