12156331 has 8 divisors (see below), whose sum is σ = 13399344. Its totient is φ = 10936320.

The previous prime is 12156329. The next prime is 12156337. The reversal of 12156331 is 13365121.

It is a happy number.

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 12156331 - 2¹ = 12156329 is a prime.

It is a super-2 number, since 2×12156331² = 295552766763122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12156337) 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, 4630 + ... + 6763.

It is an arithmetic number, because the mean of its divisors is an integer number (1674918).

Almost surely, 2^12156331 is an apocalyptic number.

12156331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12156331 is a deficient number, since it is larger than the sum of its proper divisors (1243013).

12156331 is a wasteful number, since it uses less digits than its factorization.

12156331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11501.

The product of its digits is 540, while the sum is 22.

The square root of 12156331 is about 3486.5930361888. The cubic root of 12156331 is about 229.9327528671.

The spelling of 12156331 in words is "twelve million, one hundred fifty-six thousand, three hundred thirty-one".