697131697 has 2 divisors, whose sum is σ = 697131698. Its totient is φ = 697131696.

The previous prime is 697131637. The next prime is 697131713. The reversal of 697131697 is 796131796.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 652495936 + 44635761 = 25544^2 + 6681^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-697131697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 697131697.

It is not a weakly prime, because it can be changed into another prime (697131637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348565848 + 348565849.

It is an arithmetic number, because the mean of its divisors is an integer number (348565849).

Almost surely, 2^697131697 is an apocalyptic number.

It is an amenable number.

697131697 is a deficient number, since it is larger than the sum of its proper divisors (1).

697131697 is an equidigital number, since it uses as much as digits as its factorization.

697131697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 428652, while the sum is 49.

The square root of 697131697 is about 26403.2516368723. The cubic root of 697131697 is about 886.6895902234.

Subtracting 697131697 from its reverse (796131796), we obtain a palindrome (99000099).

The spelling of 697131697 in words is "six hundred ninety-seven million, one hundred thirty-one thousand, six hundred ninety-seven".