715001981 has 2 divisors, whose sum is σ = 715001982. Its totient is φ = 715001980.

The previous prime is 715001951. The next prime is 715002007. The reversal of 715001981 is 189100517.

715001981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 429898756 + 285103225 = 20734^2 + 16885^2 .

It is an emirp because it is prime and its reverse (189100517) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 715001981 - 2¹⁴ = 714985597 is a prime.

It is a super-2 number, since 2×715001981² = 1022455665667848722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (715001921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 357500990 + 357500991.

It is an arithmetic number, because the mean of its divisors is an integer number (357500991).

Almost surely, 2^715001981 is an apocalyptic number.

It is an amenable number.

715001981 is a deficient number, since it is larger than the sum of its proper divisors (1).

715001981 is an equidigital number, since it uses as much as digits as its factorization.

715001981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 32.

The square root of 715001981 is about 26739.5209568160. The cubic root of 715001981 is about 894.2022295069.

The spelling of 715001981 in words is "seven hundred fifteen million, one thousand, nine hundred eighty-one".