715977397 has 2 divisors, whose sum is σ = 715977398. Its totient is φ = 715977396.

The previous prime is 715977377. The next prime is 715977407. The reversal of 715977397 is 793779517.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 400240036 + 315737361 = 20006^2 + 17769^2 .

It is an emirp because it is prime and its reverse (793779517) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-715977397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (715977377) 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 as a sum of consecutive naturals, namely, 357988698 + 357988699.

It is an arithmetic number, because the mean of its divisors is an integer number (357988699).

Almost surely, 2^715977397 is an apocalyptic number.

It is an amenable number.

715977397 is a deficient number, since it is larger than the sum of its proper divisors (1).

715977397 is an equidigital number, since it uses as much as digits as its factorization.

715977397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2917215, while the sum is 55.

The square root of 715977397 is about 26757.7539603009. The cubic root of 715977397 is about 894.6086725910.

The spelling of 715977397 in words is "seven hundred fifteen million, nine hundred seventy-seven thousand, three hundred ninety-seven".