715777021 has 2 divisors, whose sum is σ = 715777022. Its totient is φ = 715777020.

The previous prime is 715777019. The next prime is 715777033. The reversal of 715777021 is 120777517.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 679644900 + 36132121 = 26070^2 + 6011^2 .

It is a cyclic number.

It is not a de Polignac number, because 715777021 - 2¹ = 715777019 is a prime.

Together with 715777019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (715777121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 357888510 + 357888511.

It is an arithmetic number, because the mean of its divisors is an integer number (357888511).

Almost surely, 2^715777021 is an apocalyptic number.

It is an amenable number.

715777021 is a deficient number, since it is larger than the sum of its proper divisors (1).

715777021 is an equidigital number, since it uses as much as digits as its factorization.

715777021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24010, while the sum is 37.

The square root of 715777021 is about 26754.0094378394. The cubic root of 715777021 is about 894.5252086747.

The spelling of 715777021 in words is "seven hundred fifteen million, seven hundred seventy-seven thousand, twenty-one".