31043993 has 2 divisors, whose sum is σ = 31043994. Its totient is φ = 31043992.

The previous prime is 31043983. The next prime is 31044019. The reversal of 31043993 is 39934013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16581184 + 14462809 = 4072^2 + 3803^2 .

It is a cyclic number.

It is not a de Polignac number, because 31043993 - 2⁸ = 31043737 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31043953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15521996 + 15521997.

It is an arithmetic number, because the mean of its divisors is an integer number (15521997).

Almost surely, 2^31043993 is an apocalyptic number.

It is an amenable number.

31043993 is a deficient number, since it is larger than the sum of its proper divisors (1).

31043993 is an equidigital number, since it uses as much as digits as its factorization.

31043993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 32.

The square root of 31043993 is about 5571.7136502157. The cubic root of 31043993 is about 314.2865958161.

The spelling of 31043993 in words is "thirty-one million, forty-three thousand, nine hundred ninety-three".