715561997 has 2 divisors, whose sum is σ = 715561998. Its totient is φ = 715561996.

The previous prime is 715561969. The next prime is 715562009. The reversal of 715561997 is 799165517.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 673194916 + 42367081 = 25946^2 + 6509^2 .

It is a cyclic number.

It is not a de Polignac number, because 715561997 - 2¹² = 715557901 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 (715561967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 357780998 + 357780999.

It is an arithmetic number, because the mean of its divisors is an integer number (357780999).

Almost surely, 2^715561997 is an apocalyptic number.

It is an amenable number.

715561997 is a deficient number, since it is larger than the sum of its proper divisors (1).

715561997 is an equidigital number, since it uses as much as digits as its factorization.

715561997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 595350, while the sum is 50.

The square root of 715561997 is about 26749.9905981292. The cubic root of 715561997 is about 894.4356260037.

It can be divided in two parts, 715561 and 997, that multiplied together give a palindrome (713414317).

The spelling of 715561997 in words is "seven hundred fifteen million, five hundred sixty-one thousand, nine hundred ninety-seven".