621872311 has 2 divisors, whose sum is σ = 621872312. Its totient is φ = 621872310.

The previous prime is 621872287. The next prime is 621872353. The reversal of 621872311 is 113278126.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 621872311 - 2⁹ = 621871799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621872371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310936155 + 310936156.

It is an arithmetic number, because the mean of its divisors is an integer number (310936156).

Almost surely, 2^621872311 is an apocalyptic number.

621872311 is a deficient number, since it is larger than the sum of its proper divisors (1).

621872311 is an equidigital number, since it uses as much as digits as its factorization.

621872311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 31.

The square root of 621872311 is about 24937.3677640604. The cubic root of 621872311 is about 853.5593815241.

The spelling of 621872311 in words is "six hundred twenty-one million, eight hundred seventy-two thousand, three hundred eleven".