31934921 has 2 divisors, whose sum is σ = 31934922. Its totient is φ = 31934920.

The previous prime is 31934863. The next prime is 31934927. The reversal of 31934921 is 12943913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30680521 + 1254400 = 5539^2 + 1120^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31934921 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (31934927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15967460 + 15967461.

It is an arithmetic number, because the mean of its divisors is an integer number (15967461).

Almost surely, 2^31934921 is an apocalyptic number.

It is an amenable number.

31934921 is a deficient number, since it is larger than the sum of its proper divisors (1).

31934921 is an equidigital number, since it uses as much as digits as its factorization.

31934921 is an evil number, because the sum of its binary digits is even.

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

The square root of 31934921 is about 5651.0990966360. The cubic root of 31934921 is about 317.2648425095.

The spelling of 31934921 in words is "thirty-one million, nine hundred thirty-four thousand, nine hundred twenty-one".