31241812 has 30 divisors (see below), whose sum is σ = 63801178. Its totient is φ = 13385232.

The previous prime is 31241809. The next prime is 31241813. The reversal of 31241812 is 21814213.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 31203396 + 38416 = 5586^2 + 196^2 .

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31241813) 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, 7978 + ... + 11230.

Almost surely, 2^31241812 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 31241812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31900589).

31241812 is an abundant number, since it is smaller than the sum of its proper divisors (32559366).

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

31241812 is an equidigital number, since it uses as much as digits as its factorization.

31241812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3285 (or 3262 counting only the distinct ones).

The product of its digits is 384, while the sum is 22.

The square root of 31241812 is about 5589.4375387869. The cubic root of 31241812 is about 314.9527501145.

It can be divided in two parts, 312 and 41812, that added together give a palindrome (42124).

The spelling of 31241812 in words is "thirty-one million, two hundred forty-one thousand, eight hundred twelve".