307691 has 2 divisors, whose sum is σ = 307692. Its totient is φ = 307690.

The previous prime is 307687. The next prime is 307693. The reversal of 307691 is 196703.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 307691 - 2² = 307687 is a prime.

Together with 307693, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 307691.

It is not a weakly prime, because it can be changed into another prime (307693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153845 + 153846.

It is an arithmetic number, because the mean of its divisors is an integer number (153846).

2³⁰⁷⁶⁹¹ is an apocalyptic number.

307691 is a deficient number, since it is larger than the sum of its proper divisors (1).

307691 is an equidigital number, since it uses as much as digits as its factorization.

307691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 307691 is about 554.6990174861. The cubic root of 307691 is about 67.5105424777.

The spelling of 307691 in words is "three hundred seven thousand, six hundred ninety-one".