715396247721 has 15 divisors (see below), whose sum is σ = 1068689716941. Its totient is φ = 476925756948.

The previous prime is 715396247711. The next prime is 715396247777. The reversal of 715396247721 is 127742693517.

The square root of 715396247721 is 845811.

It is a perfect power (a square), and thus also a powerful number.

715396247721 is a `hidden beast` number, since 7 + 1 + 5 + 3 + 9 + 624 + 7 + 7 + 2 + 1 = 666.

It is not a de Polignac number, because 715396247721 - 2¹¹ = 715396245673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (715396247711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 7565310 + ... + 7659288.

Almost surely, 2^715396247721 is an apocalyptic number.

715396247721 is the 845811-st square number.

715396247721 is the 422906-th centered octagonal number.

It is an amenable number.

715396247721 is a deficient number, since it is larger than the sum of its proper divisors (353293469220).

715396247721 is an frugal number, since it uses more digits than its factorization.

715396247721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187970 (or 93982 counting only the distinct ones).

The product of its digits is 4445280, while the sum is 54.

The spelling of 715396247721 in words is "seven hundred fifteen billion, three hundred ninety-six million, two hundred forty-seven thousand, seven hundred twenty-one".