11571731 has 2 divisors, whose sum is σ = 11571732. Its totient is φ = 11571730.

The previous prime is 11571727. The next prime is 11571733. The reversal of 11571731 is 13717511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11571731 - 2² = 11571727 is a prime.

It is a super-2 number, since 2×11571731² = 267809916672722, which contains 22 as substring.

Together with 11571733, 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 11571731.

It is not a weakly prime, because it can be changed into another prime (11571733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5785865 + 5785866.

It is an arithmetic number, because the mean of its divisors is an integer number (5785866).

Almost surely, 2^11571731 is an apocalyptic number.

11571731 is a deficient number, since it is larger than the sum of its proper divisors (1).

11571731 is an equidigital number, since it uses as much as digits as its factorization.

11571731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 735, while the sum is 26.

The square root of 11571731 is about 3401.7247096142. The cubic root of 11571731 is about 226.1862028237.

The spelling of 11571731 in words is "eleven million, five hundred seventy-one thousand, seven hundred thirty-one".