31294921 has 8 divisors (see below), whose sum is σ = 35819264. Its totient is φ = 26784000.

The previous prime is 31294897. The next prime is 31294937. The reversal of 31294921 is 12949213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31294921 - 2⁷ = 31294793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31294961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2281 + ... + 8233.

It is an arithmetic number, because the mean of its divisors is an integer number (4477408).

Almost surely, 2^31294921 is an apocalyptic number.

It is an amenable number.

31294921 is a deficient number, since it is larger than the sum of its proper divisors (4524343).

31294921 is an equidigital number, since it uses as much as digits as its factorization.

31294921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6711.

The product of its digits is 3888, while the sum is 31.

The square root of 31294921 is about 5594.1863572820. The cubic root of 31294921 is about 315.1311153172.

The spelling of 31294921 in words is "thirty-one million, two hundred ninety-four thousand, nine hundred twenty-one".