12158131 has 2 divisors, whose sum is σ = 12158132. Its totient is φ = 12158130.

The previous prime is 12158129. The next prime is 12158137. The reversal of 12158131 is 13185121.

12158131 = 1421² + 1422² + ... + 1426².

12158131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12158131 - 2¹ = 12158129 is a prime.

It is a super-2 number, since 2×12158131² = 295640298826322, which contains 22 as substring.

Together with 12158129, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12158137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6079065 + 6079066.

It is an arithmetic number, because the mean of its divisors is an integer number (6079066).

Almost surely, 2^12158131 is an apocalyptic number.

12158131 is a deficient number, since it is larger than the sum of its proper divisors (1).

12158131 is an equidigital number, since it uses as much as digits as its factorization.

12158131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 240, while the sum is 22.

The square root of 12158131 is about 3486.8511582802. The cubic root of 12158131 is about 229.9441010973.

The spelling of 12158131 in words is "twelve million, one hundred fifty-eight thousand, one hundred thirty-one".