31135312 has 20 divisors (see below), whose sum is σ = 64965460. Its totient is φ = 14370048.

The previous prime is 31135309. The next prime is 31135331. The reversal of 31135312 is 21353113.

It can be written as a sum of positive squares in 2 ways, for example, as 1498176 + 29637136 = 1224^2 + 5444^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31135312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74637 + ... + 75052.

It is an arithmetic number, because the mean of its divisors is an integer number (3248273).

Almost surely, 2^31135312 is an apocalyptic number.

It is an amenable number.

31135312 is an abundant number, since it is smaller than the sum of its proper divisors (33830148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31135312 is a wasteful number, since it uses less digits than its factorization.

31135312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149710 (or 149704 counting only the distinct ones).

The product of its digits is 270, while the sum is 19.

The square root of 31135312 is about 5579.9025081089. The cubic root of 31135312 is about 314.5944625899.

Adding to 31135312 its reverse (21353113), we get a palindrome (52488425).

The spelling of 31135312 in words is "thirty-one million, one hundred thirty-five thousand, three hundred twelve".