12491431 has 4 divisors (see below), whose sum is σ = 12922200. Its totient is φ = 12060664.

The previous prime is 12491399. The next prime is 12491443. The reversal of 12491431 is 13419421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13419421 = 373 ⋅35977.

It is a cyclic number.

It is not a de Polignac number, because 12491431 - 2⁵ = 12491399 is a prime.

It is a super-3 number, since 3×12491431³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12491396 and 12491405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12491131) 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, 215341 + ... + 215398.

It is an arithmetic number, because the mean of its divisors is an integer number (3230550).

Almost surely, 2^12491431 is an apocalyptic number.

12491431 is a deficient number, since it is larger than the sum of its proper divisors (430769).

12491431 is an equidigital number, since it uses as much as digits as its factorization.

12491431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430768.

The product of its digits is 864, while the sum is 25.

The square root of 12491431 is about 3534.3218585749. The cubic root of 12491431 is about 232.0263978583.

The spelling of 12491431 in words is "twelve million, four hundred ninety-one thousand, four hundred thirty-one".