31312343 has 4 divisors (see below), whose sum is σ = 31343520. Its totient is φ = 31281168.

The previous prime is 31312327. The next prime is 31312363. The reversal of 31312343 is 34321313.

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 31312343 - 2⁴ = 31312327 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 (31312363) 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, 14030 + ... + 16107.

It is an arithmetic number, because the mean of its divisors is an integer number (7835880).

Almost surely, 2^31312343 is an apocalyptic number.

31312343 is a deficient number, since it is larger than the sum of its proper divisors (31177).

31312343 is a wasteful number, since it uses less digits than its factorization.

31312343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31176.

The product of its digits is 648, while the sum is 20.

The square root of 31312343 is about 5595.7432928968. The cubic root of 31312343 is about 315.1895826938.

Adding to 31312343 its reverse (34321313), we get a palindrome (65633656).

The spelling of 31312343 in words is "thirty-one million, three hundred twelve thousand, three hundred forty-three".