11531731 has 2 divisors, whose sum is σ = 11531732. Its totient is φ = 11531730.

The previous prime is 11531713. The next prime is 11531743. The reversal of 11531731 is 13713511.

11531731 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (11531713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11531731 - 2⁵ = 11531699 is a prime.

It is a super-2 number, since 2×11531731² = 265961639712722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11531791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5765865 + 5765866.

It is an arithmetic number, because the mean of its divisors is an integer number (5765866).

Almost surely, 2^11531731 is an apocalyptic number.

11531731 is a deficient number, since it is larger than the sum of its proper divisors (1).

11531731 is an equidigital number, since it uses as much as digits as its factorization.

11531731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 315, while the sum is 22.

The square root of 11531731 is about 3395.8402494817. The cubic root of 11531731 is about 225.9252826857.

The spelling of 11531731 in words is "eleven million, five hundred thirty-one thousand, seven hundred thirty-one".