31812343 has 4 divisors (see below), whose sum is σ = 31862160. Its totient is φ = 31762528.

The previous prime is 31812329. The next prime is 31812367. The reversal of 31812343 is 34321813.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31812343 - 2⁵ = 31812311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31812643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23938 + ... + 25231.

It is an arithmetic number, because the mean of its divisors is an integer number (7965540).

Almost surely, 2^31812343 is an apocalyptic number.

31812343 is a deficient number, since it is larger than the sum of its proper divisors (49817).

31812343 is an equidigital number, since it uses as much as digits as its factorization.

31812343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49816.

The product of its digits is 1728, while the sum is 25.

The square root of 31812343 is about 5640.2431685168. The cubic root of 31812343 is about 316.8583955576.

The spelling of 31812343 in words is "thirty-one million, eight hundred twelve thousand, three hundred forty-three".