691297 has 2 divisors, whose sum is σ = 691298. Its totient is φ = 691296.

The previous prime is 691289. The next prime is 691309. The reversal of 691297 is 792196.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 678976 + 12321 = 824^2 + 111^2 .

It is a cyclic number.

It is not a de Polignac number, because 691297 - 2³ = 691289 is a prime.

It is equal to p₅₅₈₉₇ and since 691297 and 55897 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (691267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345648 + 345649.

It is an arithmetic number, because the mean of its divisors is an integer number (345649).

2⁶⁹¹²⁹⁷ is an apocalyptic number.

It is an amenable number.

691297 is a deficient number, since it is larger than the sum of its proper divisors (1).

691297 is an equidigital number, since it uses as much as digits as its factorization.

691297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 34.

The square root of 691297 is about 831.4427220200. The cubic root of 691297 is about 88.4208917815.

The spelling of 691297 in words is "six hundred ninety-one thousand, two hundred ninety-seven".