621266831 has 2 divisors, whose sum is σ = 621266832. Its totient is φ = 621266830.

The previous prime is 621266801. The next prime is 621266879. The reversal of 621266831 is 138662126.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621266831 is a prime.

It is a super-2 number, since 2×621266831² = 771944950601565122, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 621266791 and 621266800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621266801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310633415 + 310633416.

It is an arithmetic number, because the mean of its divisors is an integer number (310633416).

Almost surely, 2^621266831 is an apocalyptic number.

621266831 is a deficient number, since it is larger than the sum of its proper divisors (1).

621266831 is an equidigital number, since it uses as much as digits as its factorization.

621266831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 35.

The square root of 621266831 is about 24925.2247933695. The cubic root of 621266831 is about 853.2822716062.

The spelling of 621266831 in words is "six hundred twenty-one million, two hundred sixty-six thousand, eight hundred thirty-one".