31115130 has 32 divisors (see below), whose sum is σ = 74962368. Its totient is φ = 8265600.

The previous prime is 31115129. The next prime is 31115191. The reversal of 31115130 is 3151113.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6585 + ... + 10275.

It is an arithmetic number, because the mean of its divisors is an integer number (2342574).

Almost surely, 2^31115130 is an apocalyptic number.

31115130 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31115130 is an abundant number, since it is smaller than the sum of its proper divisors (43847238).

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

31115130 is a wasteful number, since it uses less digits than its factorization.

31115130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3982.

The product of its (nonzero) digits is 45, while the sum is 15.

The square root of 31115130 is about 5578.0937604167. The cubic root of 31115130 is about 314.5264742151.

Adding to 31115130 its reverse (3151113), we get a palindrome (34266243).

The spelling of 31115130 in words is "thirty-one million, one hundred fifteen thousand, one hundred thirty".