12431137 has 4 divisors (see below), whose sum is σ = 12438676. Its totient is φ = 12423600.

The previous prime is 12431117. The next prime is 12431143. The reversal of 12431137 is 73113421.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 73113421 = 107 ⋅683303.

It can be written as a sum of positive squares in 2 ways, for example, as 4835601 + 7595536 = 2199^2 + 2756^2 .

It is a cyclic number.

It is not a de Polignac number, because 12431137 - 2¹⁵ = 12398369 is a prime.

It is a super-2 number, since 2×12431137² = 309066334225538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12431117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114 + ... + 4987.

It is an arithmetic number, because the mean of its divisors is an integer number (3109669).

Almost surely, 2^12431137 is an apocalyptic number.

It is an amenable number.

12431137 is a deficient number, since it is larger than the sum of its proper divisors (7539).

12431137 is an equidigital number, since it uses as much as digits as its factorization.

12431137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7538.

The product of its digits is 504, while the sum is 22.

The square root of 12431137 is about 3525.7817572845. The cubic root of 12431137 is about 231.6524783563.

Adding to 12431137 its reverse (73113421), we get a palindrome (85544558).

The spelling of 12431137 in words is "twelve million, four hundred thirty-one thousand, one hundred thirty-seven".