931691 has 2 divisors, whose sum is σ = 931692. Its totient is φ = 931690.

The previous prime is 931657. The next prime is 931709. The reversal of 931691 is 196139.

It is a strong prime.

It is an emirp because it is prime and its reverse (196139) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 931691 - 2¹⁰ = 930667 is a prime.

It is not a weakly prime, because it can be changed into another prime (931621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 465845 + 465846.

It is an arithmetic number, because the mean of its divisors is an integer number (465846).

2⁹³¹⁶⁹¹ is an apocalyptic number.

931691 is a deficient number, since it is larger than the sum of its proper divisors (1).

931691 is an equidigital number, since it uses as much as digits as its factorization.

931691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1458, while the sum is 29.

The square root of 931691 is about 965.2414205783. The cubic root of 931691 is about 97.6691257028.

The spelling of 931691 in words is "nine hundred thirty-one thousand, six hundred ninety-one".