31883213 has 2 divisors, whose sum is σ = 31883214. Its totient is φ = 31883212.

The previous prime is 31883207. The next prime is 31883219. The reversal of 31883213 is 31238813.

It is a balanced prime because it is at equal distance from previous prime (31883207) and next prime (31883219).

It can be written as a sum of positive squares in only one way, i.e., 31114084 + 769129 = 5578^2 + 877^2 .

It is an emirp because it is prime and its reverse (31238813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31883213 - 2¹⁴ = 31866829 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 (31883219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15941606 + 15941607.

It is an arithmetic number, because the mean of its divisors is an integer number (15941607).

Almost surely, 2^31883213 is an apocalyptic number.

It is an amenable number.

31883213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31883213 is an equidigital number, since it uses as much as digits as its factorization.

31883213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 29.

The square root of 31883213 is about 5646.5222039765. The cubic root of 31883213 is about 317.0935149872.

The spelling of 31883213 in words is "thirty-one million, eight hundred eighty-three thousand, two hundred thirteen".