31131122 has 24 divisors (see below), whose sum is σ = 51667308. Its totient is φ = 14057120.

The previous prime is 31131119. The next prime is 31131127. The reversal of 31131122 is 22113113.

It can be written as a sum of positive squares in 2 ways, for example, as 30129121 + 1002001 = 5489^2 + 1001^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31131097 and 31131106.

It is not an unprimeable number, because it can be changed into a prime (31131127) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47348 + ... + 48000.

Almost surely, 2^31131122 is an apocalyptic number.

31131122 is a deficient number, since it is larger than the sum of its proper divisors (20536186).

31131122 is a wasteful number, since it uses less digits than its factorization.

31131122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874 (or 863 counting only the distinct ones).

The product of its digits is 36, while the sum is 14.

The square root of 31131122 is about 5579.5270408880. The cubic root of 31131122 is about 314.5803498901.

Adding to 31131122 its reverse (22113113), we get a palindrome (53244235).

Subtracting from 31131122 its reverse (22113113), we obtain a square (9018009 = 3003²).

The spelling of 31131122 in words is "thirty-one million, one hundred thirty-one thousand, one hundred twenty-two".