715505521 has 2 divisors, whose sum is σ = 715505522. Its totient is φ = 715505520.

The previous prime is 715505447. The next prime is 715505543. The reversal of 715505521 is 125505517.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 701667121 + 13838400 = 26489^2 + 3720^2 .

It is a cyclic number.

It is not a de Polignac number, because 715505521 - 2²⁵ = 681951089 is a prime.

It is not a weakly prime, because it can be changed into another prime (715505821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 357752760 + 357752761.

It is an arithmetic number, because the mean of its divisors is an integer number (357752761).

Almost surely, 2^715505521 is an apocalyptic number.

It is an amenable number.

715505521 is a deficient number, since it is larger than the sum of its proper divisors (1).

715505521 is an equidigital number, since it uses as much as digits as its factorization.

715505521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8750, while the sum is 31.

The square root of 715505521 is about 26748.9349507602. The cubic root of 715505521 is about 894.4120941618.

The spelling of 715505521 in words is "seven hundred fifteen million, five hundred five thousand, five hundred twenty-one".