7315616621 has 2 divisors, whose sum is σ = 7315616622. Its totient is φ = 7315616620.

The previous prime is 7315616611. The next prime is 7315616629. The reversal of 7315616621 is 1266165137.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7198674025 + 116942596 = 84845^2 + 10814^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7315616621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7315616629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3657808310 + 3657808311.

It is an arithmetic number, because the mean of its divisors is an integer number (3657808311).

Almost surely, 2^7315616621 is an apocalyptic number.

It is an amenable number.

7315616621 is a deficient number, since it is larger than the sum of its proper divisors (1).

7315616621 is an equidigital number, since it uses as much as digits as its factorization.

7315616621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 38.

The square root of 7315616621 is about 85531.3779907701. The cubic root of 7315616621 is about 1941.2597320914.

The spelling of 7315616621 in words is "seven billion, three hundred fifteen million, six hundred sixteen thousand, six hundred twenty-one".