624311020981 has 2 divisors, whose sum is σ = 624311020982. Its totient is φ = 624311020980.

The previous prime is 624311020933. The next prime is 624311020987. The reversal of 624311020981 is 189020113426.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 506956816081 + 117354204900 = 712009^2 + 342570^2 .

It is a cyclic number.

It is not a de Polignac number, because 624311020981 - 2²⁷ = 624176803253 is a prime.

It is a super-2 number, since 2×624311020981² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 624311020981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (624311020987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312155510490 + 312155510491.

It is an arithmetic number, because the mean of its divisors is an integer number (312155510491).

Almost surely, 2^624311020981 is an apocalyptic number.

It is an amenable number.

624311020981 is a deficient number, since it is larger than the sum of its proper divisors (1).

624311020981 is an equidigital number, since it uses as much as digits as its factorization.

624311020981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The spelling of 624311020981 in words is "six hundred twenty-four billion, three hundred eleven million, twenty thousand, nine hundred eighty-one".