12135637431 has 8 divisors (see below), whose sum is σ = 17978722160. Its totient is φ = 8090424936.

The previous prime is 12135637427. The next prime is 12135637471. The reversal of 12135637431 is 13473653121.

12135637431 is a `hidden beast` number, since 1 + 2 + 13 + 5 + 637 + 4 + 3 + 1 = 666.

It is not a de Polignac number, because 12135637431 - 2² = 12135637427 is a prime.

It is a super-2 number, since 2×12135637431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12135637411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224734000 + ... + 224734053.

It is an arithmetic number, because the mean of its divisors is an integer number (2247340270).

Almost surely, 2^12135637431 is an apocalyptic number.

12135637431 is a deficient number, since it is larger than the sum of its proper divisors (5843084729).

12135637431 is an equidigital number, since it uses as much as digits as its factorization.

12135637431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449468062 (or 449468056 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The spelling of 12135637431 in words is "twelve billion, one hundred thirty-five million, six hundred thirty-seven thousand, four hundred thirty-one".