31925213 has 2 divisors, whose sum is σ = 31925214. Its totient is φ = 31925212.

The previous prime is 31925209. The next prime is 31925227. The reversal of 31925213 is 31252913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19123129 + 12802084 = 4373^2 + 3578^2 .

It is an emirp because it is prime and its reverse (31252913) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31925213 - 2² = 31925209 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31925233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15962606 + 15962607.

It is an arithmetic number, because the mean of its divisors is an integer number (15962607).

Almost surely, 2^31925213 is an apocalyptic number.

It is an amenable number.

31925213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31925213 is an equidigital number, since it uses as much as digits as its factorization.

31925213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1620, while the sum is 26.

The square root of 31925213 is about 5650.2400833947. The cubic root of 31925213 is about 317.2326904625.

The spelling of 31925213 in words is "thirty-one million, nine hundred twenty-five thousand, two hundred thirteen".