11591731 has 2 divisors, whose sum is σ = 11591732. Its totient is φ = 11591730.

The previous prime is 11591719. The next prime is 11591761. The reversal of 11591731 is 13719511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11591731 - 2⁹ = 11591219 is a prime.

It is a super-2 number, since 2×11591731² = 268736455152722, which contains 22 as substring.

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 11591731.

It is not a weakly prime, because it can be changed into another prime (11591711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5795865 + 5795866.

It is an arithmetic number, because the mean of its divisors is an integer number (5795866).

Almost surely, 2^11591731 is an apocalyptic number.

11591731 is a deficient number, since it is larger than the sum of its proper divisors (1).

11591731 is an equidigital number, since it uses as much as digits as its factorization.

11591731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 945, while the sum is 28.

The square root of 11591731 is about 3404.6631257732. The cubic root of 11591731 is about 226.3164374551.

The spelling of 11591731 in words is "eleven million, five hundred ninety-one thousand, seven hundred thirty-one".