31043393 has 4 divisors (see below), whose sum is σ = 31054548. Its totient is φ = 31032240.

The previous prime is 31043371. The next prime is 31043417. The reversal of 31043393 is 39334013.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 29669809 + 1373584 = 5447^2 + 1172^2 .

It is a cyclic number.

It is not a de Polignac number, because 31043393 - 2⁶ = 31043329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31043303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2423 + ... + 8243.

It is an arithmetic number, because the mean of its divisors is an integer number (7763637).

Almost surely, 2^31043393 is an apocalyptic number.

It is an amenable number.

31043393 is a deficient number, since it is larger than the sum of its proper divisors (11155).

31043393 is an equidigital number, since it uses as much as digits as its factorization.

31043393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11154.

The product of its (nonzero) digits is 2916, while the sum is 26.

The square root of 31043393 is about 5571.6598065567. The cubic root of 31043393 is about 314.2845710210.

The spelling of 31043393 in words is "thirty-one million, forty-three thousand, three hundred ninety-three".