20131531461 has 24 divisors (see below), whose sum is σ = 30906532800. Its totient is φ = 12583495296.

The previous prime is 20131531397. The next prime is 20131531481. The reversal of 20131531461 is 16413513102.

It is a happy number.

20131531461 is a `hidden beast` number, since 20 + 131 + 53 + 1 + 461 = 666.

It is not a de Polignac number, because 20131531461 - 2⁶ = 20131531397 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131531481) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 209911 + ... + 290388.

It is an arithmetic number, because the mean of its divisors is an integer number (1287772200).

Almost surely, 2^20131531461 is an apocalyptic number.

It is an amenable number.

20131531461 is a deficient number, since it is larger than the sum of its proper divisors (10775001339).

20131531461 is a wasteful number, since it uses less digits than its factorization.

20131531461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500585 (or 500582 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The spelling of 20131531461 in words is "twenty billion, one hundred thirty-one million, five hundred thirty-one thousand, four hundred sixty-one".