12135931 has 2 divisors, whose sum is σ = 12135932. Its totient is φ = 12135930.

The previous prime is 12135913. The next prime is 12135941. The reversal of 12135931 is 13953121.

Together with previous prime (12135913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12135931 - 2⁵ = 12135899 is a prime.

It is a super-2 number, since 2×12135931² = 294561642473522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12135896 and 12135905.

It is not a weakly prime, because it can be changed into another prime (12135941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6067965 + 6067966.

It is an arithmetic number, because the mean of its divisors is an integer number (6067966).

Almost surely, 2^12135931 is an apocalyptic number.

12135931 is a deficient number, since it is larger than the sum of its proper divisors (1).

12135931 is an equidigital number, since it uses as much as digits as its factorization.

12135931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 810, while the sum is 25.

The square root of 12135931 is about 3483.6663158230. Note that the first 3 decimals coincide. The cubic root of 12135931 is about 229.8040612290.

The spelling of 12135931 in words is "twelve million, one hundred thirty-five thousand, nine hundred thirty-one".