31012220113 has 4 divisors (see below), whose sum is σ = 35442537280. Its totient is φ = 26581902948.

The previous prime is 31012220101. The next prime is 31012220149. The reversal of 31012220113 is 31102221013.

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: 31102221013 = 22643 ⋅1373591.

It is a cyclic number.

It is not a de Polignac number, because 31012220113 - 2²⁵ = 30978665681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31012229113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2215158573 + ... + 2215158586.

It is an arithmetic number, because the mean of its divisors is an integer number (8860634320).

Almost surely, 2^31012220113 is an apocalyptic number.

It is an amenable number.

31012220113 is a deficient number, since it is larger than the sum of its proper divisors (4430317167).

31012220113 is an equidigital number, since it uses as much as digits as its factorization.

31012220113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4430317166.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31012220113 its reverse (31102221013), we get a palindrome (62114441126).

The spelling of 31012220113 in words is "thirty-one billion, twelve million, two hundred twenty thousand, one hundred thirteen".