591691 has 2 divisors, whose sum is σ = 591692. Its totient is φ = 591690.

The previous prime is 591673. The next prime is 591709. The reversal of 591691 is 196195.

It is a balanced prime because it is at equal distance from previous prime (591673) and next prime (591709).

It is a cyclic number.

It is not a de Polignac number, because 591691 - 2⁵ = 591659 is a prime.

It is not a weakly prime, because it can be changed into another prime (591601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 295845 + 295846.

It is an arithmetic number, because the mean of its divisors is an integer number (295846).

2⁵⁹¹⁶⁹¹ is an apocalyptic number.

591691 is a deficient number, since it is larger than the sum of its proper divisors (1).

591691 is an equidigital number, since it uses as much as digits as its factorization.

591691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2430, while the sum is 31.

The square root of 591691 is about 769.2145344441. The cubic root of 591691 is about 83.9521174575.

The spelling of 591691 in words is "five hundred ninety-one thousand, six hundred ninety-one".