31142332313 has 4 divisors (see below), whose sum is σ = 31149024180. Its totient is φ = 31135640448.

The previous prime is 31142332303. The next prime is 31142332357. The reversal of 31142332313 is 31323324113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31323324113 = 144413 ⋅216901.

It can be written as a sum of positive squares in 2 ways, for example, as 6251590489 + 24890741824 = 79067^2 + 157768^2 .

It is a cyclic number.

It is not a de Polignac number, because 31142332313 - 2⁸ = 31142332057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31142332303) 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, 3338948 + ... + 3348261.

It is an arithmetic number, because the mean of its divisors is an integer number (7787256045).

Almost surely, 2^31142332313 is an apocalyptic number.

It is an amenable number.

31142332313 is a deficient number, since it is larger than the sum of its proper divisors (6691867).

31142332313 is an equidigital number, since it uses as much as digits as its factorization.

31142332313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6691866.

The product of its digits is 3888, while the sum is 26.

Adding to 31142332313 its reverse (31323324113), we get a palindrome (62465656426).

The spelling of 31142332313 in words is "thirty-one billion, one hundred forty-two million, three hundred thirty-two thousand, three hundred thirteen".