715748021 has 2 divisors, whose sum is σ = 715748022. Its totient is φ = 715748020.

The previous prime is 715748009. The next prime is 715748041. The reversal of 715748021 is 120847517.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 661209796 + 54538225 = 25714^2 + 7385^2 .

It is a cyclic number.

It is not a de Polignac number, because 715748021 - 2¹⁸ = 715485877 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (715748041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 357874010 + 357874011.

It is an arithmetic number, because the mean of its divisors is an integer number (357874011).

Almost surely, 2^715748021 is an apocalyptic number.

It is an amenable number.

715748021 is a deficient number, since it is larger than the sum of its proper divisors (1).

715748021 is an equidigital number, since it uses as much as digits as its factorization.

715748021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15680, while the sum is 35.

The square root of 715748021 is about 26753.4674575091. The cubic root of 715748021 is about 894.5131278262.

The spelling of 715748021 in words is "seven hundred fifteen million, seven hundred forty-eight thousand, twenty-one".