31113040 has 60 divisors (see below), whose sum is σ = 84158676. Its totient is φ = 10665984.

The previous prime is 31113029. The next prime is 31113059. The reversal of 31113040 is 4031113.

It can be written as a sum of positive squares in 2 ways, for example, as 23736384 + 7376656 = 4872^2 + 2716^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31113040.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49 + ... + 7888.

Almost surely, 2^31113040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31113040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42079338).

31113040 is an abundant number, since it is smaller than the sum of its proper divisors (53045636).

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

31113040 is a wasteful number, since it uses less digits than its factorization.

31113040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7964 (or 7951 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 31113040 is about 5577.9064172860. The cubic root of 31113040 is about 314.5194318207.

Adding to 31113040 its reverse (4031113), we get a palindrome (35144153).

The spelling of 31113040 in words is "thirty-one million, one hundred thirteen thousand, forty".