697679131 has 2 divisors, whose sum is σ = 697679132. Its totient is φ = 697679130.

The previous prime is 697679089. The next prime is 697679137. The reversal of 697679131 is 131976796.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-697679131 is a prime.

It is a super-2 number, since 2×697679131² = 973512339665830322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (697679137) 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, 348839565 + 348839566.

It is an arithmetic number, because the mean of its divisors is an integer number (348839566).

Almost surely, 2^697679131 is an apocalyptic number.

697679131 is a deficient number, since it is larger than the sum of its proper divisors (1).

697679131 is an equidigital number, since it uses as much as digits as its factorization.

697679131 is an odious number, because the sum of its binary digits is odd.

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

The square root of 697679131 is about 26413.6163938223. The cubic root of 697679131 is about 886.9216253034.

The spelling of 697679131 in words is "six hundred ninety-seven million, six hundred seventy-nine thousand, one hundred thirty-one".