31113072 has 50 divisors (see below), whose sum is σ = 90054008. Its totient is φ = 10370592.

The previous prime is 31113059. The next prime is 31113073. The reversal of 31113072 is 27031113.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31113073) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 10708 + ... + 13299.

Almost surely, 2^31113072 is an apocalyptic number.

It is an amenable number.

31113072 is an abundant number, since it is smaller than the sum of its proper divisors (58940936).

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

31113072 is a wasteful number, since it uses less digits than its factorization.

31113072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24027 (or 24012 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 18.

The square root of 31113072 is about 5577.9092857450. The cubic root of 31113072 is about 314.5195396492.

Adding to 31113072 its reverse (27031113), we get a palindrome (58144185).

The spelling of 31113072 in words is "thirty-one million, one hundred thirteen thousand, seventy-two".