697085861 has 2 divisors, whose sum is σ = 697085862. Its totient is φ = 697085860.

The previous prime is 697085827. The next prime is 697085869. The reversal of 697085861 is 168580796.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 387853636 + 309232225 = 19694^2 + 17585^2 .

It is a cyclic number.

It is not a de Polignac number, because 697085861 - 2⁶ = 697085797 is a prime.

It is a super-2 number, since 2×697085861² = 971857395212222642, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (697085869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348542930 + 348542931.

It is an arithmetic number, because the mean of its divisors is an integer number (348542931).

Almost surely, 2^697085861 is an apocalyptic number.

It is an amenable number.

697085861 is a deficient number, since it is larger than the sum of its proper divisors (1).

697085861 is an equidigital number, since it uses as much as digits as its factorization.

697085861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 50.

The square root of 697085861 is about 26402.3836234534. The cubic root of 697085861 is about 886.6701566907.

The spelling of 697085861 in words is "six hundred ninety-seven million, eighty-five thousand, eight hundred sixty-one".