621838831 has 2 divisors, whose sum is σ = 621838832. Its totient is φ = 621838830.

The previous prime is 621838829. The next prime is 621838837. The reversal of 621838831 is 138838126.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 621838831 - 2¹ = 621838829 is a prime.

It is a super-2 number, since 2×621838831² = 773367063478893122, which contains 22 as substring.

Together with 621838829, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621838837) 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, 310919415 + 310919416.

It is an arithmetic number, because the mean of its divisors is an integer number (310919416).

Almost surely, 2^621838831 is an apocalyptic number.

621838831 is a deficient number, since it is larger than the sum of its proper divisors (1).

621838831 is an equidigital number, since it uses as much as digits as its factorization.

621838831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 40.

The square root of 621838831 is about 24936.6964732701. The cubic root of 621838831 is about 853.5440634380.

The spelling of 621838831 in words is "six hundred twenty-one million, eight hundred thirty-eight thousand, eight hundred thirty-one".