31530234 has 16 divisors (see below), whose sum is σ = 66379680. Its totient is φ = 9956880.

The previous prime is 31530211. The next prime is 31530269. The reversal of 31530234 is 43203513.

It is a self number, because there is not a number n which added to its sum of digits gives 31530234.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138177 + ... + 138404.

It is an arithmetic number, because the mean of its divisors is an integer number (4148730).

Almost surely, 2^31530234 is an apocalyptic number.

31530234 is an abundant number, since it is smaller than the sum of its proper divisors (34849446).

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

31530234 is a wasteful number, since it uses less digits than its factorization.

31530234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276605.

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 31530234 is about 5615.1788929650. The cubic root of 31530234 is about 315.9189892747.

Adding to 31530234 its reverse (43203513), we get a palindrome (74733747).

The spelling of 31530234 in words is "thirty-one million, five hundred thirty thousand, two hundred thirty-four".