621542972090539 has 2 divisors, whose sum is σ = 621542972090540. Its totient is φ = 621542972090538.

The previous prime is 621542972090527. The next prime is 621542972090543. The reversal of 621542972090539 is 935090279245126.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 621542972090539 - 2³⁹ = 620993216276651 is a prime.

It is a super-3 number, since 3×621542972090539³ (a number of 45 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (621542972090569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310771486045269 + 310771486045270.

It is an arithmetic number, because the mean of its divisors is an integer number (310771486045270).

Almost surely, 2^{621542972090539} is an apocalyptic number.

621542972090539 is a deficient number, since it is larger than the sum of its proper divisors (1).

621542972090539 is an equidigital number, since it uses as much as digits as its factorization.

621542972090539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73483200, while the sum is 64.

The spelling of 621542972090539 in words is "six hundred twenty-one trillion, five hundred forty-two billion, nine hundred seventy-two million, ninety thousand, five hundred thirty-nine".