621051631 has 2 divisors, whose sum is σ = 621051632. Its totient is φ = 621051630.

The previous prime is 621051611. The next prime is 621051649. The reversal of 621051631 is 136150126.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 621051631 - 2¹⁵ = 621018863 is a prime.

It is a super-2 number, since 2×621051631² = 771410256735520322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 621051596 and 621051605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621051611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310525815 + 310525816.

It is an arithmetic number, because the mean of its divisors is an integer number (310525816).

Almost surely, 2^621051631 is an apocalyptic number.

621051631 is a deficient number, since it is larger than the sum of its proper divisors (1).

621051631 is an equidigital number, since it uses as much as digits as its factorization.

621051631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 621051631 is about 24920.9075075528. The cubic root of 621051631 is about 853.1837376957.

It can be divided in two parts, 62105 and 1631, that added together give a palindrome (63736).

The spelling of 621051631 in words is "six hundred twenty-one million, fifty-one thousand, six hundred thirty-one".