621235077131 has 2 divisors, whose sum is σ = 621235077132. Its totient is φ = 621235077130.

The previous prime is 621235077109. The next prime is 621235077139. The reversal of 621235077131 is 131770532126.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621235077131 is a prime.

It is a super-2 number, since 2×621235077131² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (621235077139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310617538565 + 310617538566.

It is an arithmetic number, because the mean of its divisors is an integer number (310617538566).

Almost surely, 2^621235077131 is an apocalyptic number.

621235077131 is a deficient number, since it is larger than the sum of its proper divisors (1).

621235077131 is an equidigital number, since it uses as much as digits as its factorization.

621235077131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 38.

The spelling of 621235077131 in words is "six hundred twenty-one billion, two hundred thirty-five million, seventy-seven thousand, one hundred thirty-one".