12311731 has 2 divisors, whose sum is σ = 12311732. Its totient is φ = 12311730.

The previous prime is 12311729. The next prime is 12311759. The reversal of 12311731 is 13711321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12311731 - 2¹ = 12311729 is a prime.

It is a super-2 number, since 2×12311731² = 303157440432722, which contains 22 as substring.

Together with 12311729, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 12311699 and 12311708.

It is not a weakly prime, because it can be changed into another prime (12311701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6155865 + 6155866.

It is an arithmetic number, because the mean of its divisors is an integer number (6155866).

Almost surely, 2^12311731 is an apocalyptic number.

12311731 is a deficient number, since it is larger than the sum of its proper divisors (1).

12311731 is an equidigital number, since it uses as much as digits as its factorization.

12311731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 126, while the sum is 19.

The square root of 12311731 is about 3508.8076322306. The cubic root of 12311731 is about 230.9083861769.

The spelling of 12311731 in words is "twelve million, three hundred eleven thousand, seven hundred thirty-one".