31668893 has 2 divisors, whose sum is σ = 31668894. Its totient is φ = 31668892.

The previous prime is 31668881. The next prime is 31668913. The reversal of 31668893 is 39886613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19123129 + 12545764 = 4373^2 + 3542^2 .

It is a cyclic number.

It is not a de Polignac number, because 31668893 - 2⁶ = 31668829 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31668803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15834446 + 15834447.

It is an arithmetic number, because the mean of its divisors is an integer number (15834447).

Almost surely, 2^31668893 is an apocalyptic number.

It is an amenable number.

31668893 is a deficient number, since it is larger than the sum of its proper divisors (1).

31668893 is an equidigital number, since it uses as much as digits as its factorization.

31668893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 44.

The square root of 31668893 is about 5627.5121501424. The cubic root of 31668893 is about 316.3814126796.

The spelling of 31668893 in words is "thirty-one million, six hundred sixty-eight thousand, eight hundred ninety-three".