12231731 has 2 divisors, whose sum is σ = 12231732. Its totient is φ = 12231730.

The previous prime is 12231697. The next prime is 12231733. The reversal of 12231731 is 13713221.

12231731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12231731 - 2¹⁰ = 12230707 is a prime.

It is a super-2 number, since 2×12231731² = 299230486512722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 12231733, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (12231733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6115865 + 6115866.

It is an arithmetic number, because the mean of its divisors is an integer number (6115866).

Almost surely, 2^12231731 is an apocalyptic number.

12231731 is a deficient number, since it is larger than the sum of its proper divisors (1).

12231731 is an equidigital number, since it uses as much as digits as its factorization.

12231731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 252, while the sum is 20.

The square root of 12231731 is about 3497.3891690803. The cubic root of 12231731 is about 230.4071615874.

Adding to 12231731 its reverse (13713221), we get a palindrome (25944952).

The spelling of 12231731 in words is "twelve million, two hundred thirty-one thousand, seven hundred thirty-one".