697617979 has 2 divisors, whose sum is σ = 697617980. Its totient is φ = 697617978.

The previous prime is 697617941. The next prime is 697618007. The reversal of 697617979 is 979716796.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 697617979 - 2²³ = 689229371 is a prime.

It is not a weakly prime, because it can be changed into another prime (697617929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348808989 + 348808990.

It is an arithmetic number, because the mean of its divisors is an integer number (348808990).

Almost surely, 2^697617979 is an apocalyptic number.

697617979 is a deficient number, since it is larger than the sum of its proper divisors (1).

697617979 is an equidigital number, since it uses as much as digits as its factorization.

697617979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9001692, while the sum is 61.

The square root of 697617979 is about 26412.4587836877. The cubic root of 697617979 is about 886.8957114731.

The spelling of 697617979 in words is "six hundred ninety-seven million, six hundred seventeen thousand, nine hundred seventy-nine".