31949993 has 2 divisors, whose sum is σ = 31949994. Its totient is φ = 31949992.

The previous prime is 31949977. The next prime is 31949999. The reversal of 31949993 is 39994913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22543504 + 9406489 = 4748^2 + 3067^2 .

It is a cyclic number.

It is not a de Polignac number, because 31949993 - 2⁴ = 31949977 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 (31949999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15974996 + 15974997.

It is an arithmetic number, because the mean of its divisors is an integer number (15974997).

Almost surely, 2^31949993 is an apocalyptic number.

It is an amenable number.

31949993 is a deficient number, since it is larger than the sum of its proper divisors (1).

31949993 is an equidigital number, since it uses as much as digits as its factorization.

31949993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 236196, while the sum is 47.

The square root of 31949993 is about 5652.4324852226. The cubic root of 31949993 is about 317.3147467468.

The spelling of 31949993 in words is "thirty-one million, nine hundred forty-nine thousand, nine hundred ninety-three".