31131122122 has 4 divisors (see below), whose sum is σ = 46696683186. Its totient is φ = 15565561060.

The previous prime is 31131122119. The next prime is 31131122131. The reversal of 31131122122 is 22122113113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 27037553761 + 4093568361 = 164431^2 + 63981^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31131122122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7782780529 + ... + 7782780532.

Almost surely, 2^31131122122 is an apocalyptic number.

31131122122 is a deficient number, since it is larger than the sum of its proper divisors (15565561064).

31131122122 is a wasteful number, since it uses less digits than its factorization.

31131122122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15565561063.

The product of its digits is 144, while the sum is 19.

Adding to 31131122122 its reverse (22122113113), we get a palindrome (53253235235).

Subtracting from 31131122122 its reverse (22122113113), we obtain a palindrome (9009009009).

The spelling of 31131122122 in words is "thirty-one billion, one hundred thirty-one million, one hundred twenty-two thousand, one hundred twenty-two".