31921943 has 2 divisors, whose sum is σ = 31921944. Its totient is φ = 31921942.

The previous prime is 31921927. The next prime is 31921963. The reversal of 31921943 is 34912913.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31921943 - 2⁴ = 31921927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31921963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15960971 + 15960972.

It is an arithmetic number, because the mean of its divisors is an integer number (15960972).

Almost surely, 2^31921943 is an apocalyptic number.

31921943 is a deficient number, since it is larger than the sum of its proper divisors (1).

31921943 is an equidigital number, since it uses as much as digits as its factorization.

31921943 is an odious number, because the sum of its binary digits is odd.

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

The square root of 31921943 is about 5649.9507077496. The cubic root of 31921943 is about 317.2218590409.

The spelling of 31921943 in words is "thirty-one million, nine hundred twenty-one thousand, nine hundred forty-three".