135971245431 has 20 divisors (see below), whose sum is σ = 232134331792. Its totient is φ = 77697854208.

The previous prime is 135971245429. The next prime is 135971245451. The reversal of 135971245431 is 134542179531.

135971245431 is a `hidden beast` number, since 1 + 3 + 5 + 97 + 12 + 4 + 543 + 1 = 666.

It is not a de Polignac number, because 135971245431 - 2¹ = 135971245429 is a prime.

It is a super-2 number, since 2×135971245431² (a number of 23 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 (135971245411) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 119903530 + ... + 119904663.

Almost surely, 2^135971245431 is an apocalyptic number.

135971245431 is a deficient number, since it is larger than the sum of its proper divisors (96163086361).

135971245431 is an equidigital number, since it uses as much as digits as its factorization.

135971245431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239808212 (or 239808203 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The spelling of 135971245431 in words is "one hundred thirty-five billion, nine hundred seventy-one million, two hundred forty-five thousand, four hundred thirty-one".