31312230 has 32 divisors (see below), whose sum is σ = 75340800. Its totient is φ = 8328672.

The previous prime is 31312219. The next prime is 31312243. The reversal of 31312230 is 3221313.

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

It is a congruent 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, 13281 + ... + 15459.

It is an arithmetic number, because the mean of its divisors is an integer number (2354400).

Almost surely, 2^31312230 is an apocalyptic number.

31312230 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31312230 is an abundant number, since it is smaller than the sum of its proper divisors (44028570).

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

31312230 is a wasteful number, since it uses less digits than its factorization.

31312230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2668.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 31312230 is about 5595.7331959271. The cubic root of 31312230 is about 315.1892035412.

Adding to 31312230 its reverse (3221313), we get a palindrome (34533543).

The spelling of 31312230 in words is "thirty-one million, three hundred twelve thousand, two hundred thirty".