31440131013 has 4 divisors (see below), whose sum is σ = 41920174688. Its totient is φ = 20960087340.

The previous prime is 31440130999. The next prime is 31440131053. The reversal of 31440131013 is 31013104413.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 31440131013 - 2²⁵ = 31406576581 is a prime.

It is a super-2 number, since 2×31440131013² (a number of 22 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 (31440131053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5240021833 + ... + 5240021838.

It is an arithmetic number, because the mean of its divisors is an integer number (10480043672).

Almost surely, 2^31440131013 is an apocalyptic number.

It is an amenable number.

31440131013 is a deficient number, since it is larger than the sum of its proper divisors (10480043675).

31440131013 is a wasteful number, since it uses less digits than its factorization.

31440131013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10480043674.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 31440131013 its reverse (31013104413), we get a palindrome (62453235426).

It can be divided in two parts, 31 and 440131013, that added together give a palindrome (440131044).

The spelling of 31440131013 in words is "thirty-one billion, four hundred forty million, one hundred thirty-one thousand, thirteen".