2715591721 has 2 divisors, whose sum is σ = 2715591722. Its totient is φ = 2715591720.

The previous prime is 2715591707. The next prime is 2715591833. The reversal of 2715591721 is 1271955172.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2614890496 + 100701225 = 51136^2 + 10035^2 .

It is a cyclic number.

It is not a de Polignac number, because 2715591721 - 2²⁵ = 2682037289 is a prime.

It is not a weakly prime, because it can be changed into another prime (2715592721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1357795860 + 1357795861.

It is an arithmetic number, because the mean of its divisors is an integer number (1357795861).

Almost surely, 2^2715591721 is an apocalyptic number.

It is an amenable number.

2715591721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2715591721 is an equidigital number, since it uses as much as digits as its factorization.

2715591721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44100, while the sum is 40.

The square root of 2715591721 is about 52111.3396584659. The cubic root of 2715591721 is about 1395.1518907251.

The spelling of 2715591721 in words is "two billion, seven hundred fifteen million, five hundred ninety-one thousand, seven hundred twenty-one".