31994321 has 4 divisors (see below), whose sum is σ = 32058432. Its totient is φ = 31930212.

The previous prime is 31994299. The next prime is 31994329. The reversal of 31994321 is 12349913.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31994321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31994329) 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, 31301 + ... + 32306.

It is an arithmetic number, because the mean of its divisors is an integer number (8014608).

Almost surely, 2^31994321 is an apocalyptic number.

It is an amenable number.

31994321 is a deficient number, since it is larger than the sum of its proper divisors (64111).

31994321 is an equidigital number, since it uses as much as digits as its factorization.

31994321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64110.

The product of its digits is 5832, while the sum is 32.

The square root of 31994321 is about 5656.3522697937. The cubic root of 31994321 is about 317.4614283438.

The spelling of 31994321 in words is "thirty-one million, nine hundred ninety-four thousand, three hundred twenty-one".