715972109 has 2 divisors, whose sum is σ = 715972110. Its totient is φ = 715972108.

The previous prime is 715972099. The next prime is 715972183. The reversal of 715972109 is 901279517.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 676156009 + 39816100 = 26003^2 + 6310^2 .

It is an emirp because it is prime and its reverse (901279517) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 715972109 - 2⁴ = 715972093 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 (715972409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 357986054 + 357986055.

It is an arithmetic number, because the mean of its divisors is an integer number (357986055).

Almost surely, 2^715972109 is an apocalyptic number.

It is an amenable number.

715972109 is a deficient number, since it is larger than the sum of its proper divisors (1).

715972109 is an equidigital number, since it uses as much as digits as its factorization.

715972109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39690, while the sum is 41.

The square root of 715972109 is about 26757.6551476395. The cubic root of 715972109 is about 894.6064701461.

The spelling of 715972109 in words is "seven hundred fifteen million, nine hundred seventy-two thousand, one hundred nine".