12431861 has 12 divisors (see below), whose sum is σ = 13664196. Its totient is φ = 11243520.

The previous prime is 12431857. The next prime is 12431893. The reversal of 12431861 is 16813421.

It can be written as a sum of positive squares in 6 ways, for example, as 2540836 + 9891025 = 1594^2 + 3145^2 .

It is not a de Polignac number, because 12431861 - 2² = 12431857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12431861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12431801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48245 + ... + 48501.

It is an arithmetic number, because the mean of its divisors is an integer number (1138683).

Almost surely, 2^12431861 is an apocalyptic number.

It is an amenable number.

12431861 is a deficient number, since it is larger than the sum of its proper divisors (1232335).

12431861 is an equidigital number, since it uses as much as digits as its factorization.

12431861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392 (or 331 counting only the distinct ones).

The product of its digits is 1152, while the sum is 26.

The square root of 12431861 is about 3525.8844280549. The cubic root of 12431861 is about 231.6569754815.

The spelling of 12431861 in words is "twelve million, four hundred thirty-one thousand, eight hundred sixty-one".