12291431 has 8 divisors (see below), whose sum is σ = 12642000. Its totient is φ = 11943360.

The previous prime is 12291427. The next prime is 12291443. The reversal of 12291431 is 13419221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12291431 - 2² = 12291427 is a prime.

It is a super-2 number, since 2×12291431² = 302158552055522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12291397 and 12291406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12291451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13880 + ... + 14738.

It is an arithmetic number, because the mean of its divisors is an integer number (1580250).

Almost surely, 2^12291431 is an apocalyptic number.

12291431 is a deficient number, since it is larger than the sum of its proper divisors (350569).

12291431 is an equidigital number, since it uses as much as digits as its factorization.

12291431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249.

The product of its digits is 432, while the sum is 23.

The square root of 12291431 is about 3505.9137182766. The cubic root of 12291431 is about 230.7814065000.

The spelling of 12291431 in words is "twelve million, two hundred ninety-one thousand, four hundred thirty-one".