31440144413 has 4 divisors (see below), whose sum is σ = 31495988928. Its totient is φ = 31384299900.

The previous prime is 31440144397. The next prime is 31440144433. The reversal of 31440144413 is 31444104413.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31444104413 = 81929 ⋅383797.

It is a cyclic number.

It is not a de Polignac number, because 31440144413 - 2⁴ = 31440144397 is a prime.

It is a super-2 number, since 2×31440144413² (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 (31440144433) 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, 27921413 + ... + 27922538.

It is an arithmetic number, because the mean of its divisors is an integer number (7873997232).

Almost surely, 2^31440144413 is an apocalyptic number.

It is an amenable number.

31440144413 is a deficient number, since it is larger than the sum of its proper divisors (55844515).

31440144413 is an equidigital number, since it uses as much as digits as its factorization.

31440144413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55844514.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 31440144413 its reverse (31444104413), we get a palindrome (62884248826).

The spelling of 31440144413 in words is "thirty-one billion, four hundred forty million, one hundred forty-four thousand, four hundred thirteen".