12555431 has 4 divisors (see below), whose sum is σ = 14349072. Its totient is φ = 10761792.

The previous prime is 12555397. The next prime is 12555443. The reversal of 12555431 is 13455521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13455521 = 397 ⋅33893.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12555431 is a prime.

It is a super-2 number, since 2×12555431² = 315277695191522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12555431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12555451) 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, 896810 + ... + 896823.

It is an arithmetic number, because the mean of its divisors is an integer number (3587268).

Almost surely, 2^12555431 is an apocalyptic number.

12555431 is a deficient number, since it is larger than the sum of its proper divisors (1793641).

12555431 is an equidigital number, since it uses as much as digits as its factorization.

12555431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1793640.

The product of its digits is 3000, while the sum is 26.

The square root of 12555431 is about 3543.3643617331. The cubic root of 12555431 is about 232.4219863901.

The spelling of 12555431 in words is "twelve million, five hundred fifty-five thousand, four hundred thirty-one".