31082213 has 2 divisors, whose sum is σ = 31082214. Its totient is φ = 31082212.

The previous prime is 31082201. The next prime is 31082263. The reversal of 31082213 is 31228013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30713764 + 368449 = 5542^2 + 607^2 .

It is a cyclic number.

It is not a de Polignac number, because 31082213 - 2⁸ = 31081957 is a prime.

It is a super-2 number, since 2×31082213² = 1932207929954738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31082263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15541106 + 15541107.

It is an arithmetic number, because the mean of its divisors is an integer number (15541107).

Almost surely, 2^31082213 is an apocalyptic number.

It is an amenable number.

31082213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31082213 is an equidigital number, since it uses as much as digits as its factorization.

31082213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 31082213 is about 5575.1424197055. The cubic root of 31082213 is about 314.4155215366.

The spelling of 31082213 in words is "thirty-one million, eighty-two thousand, two hundred thirteen".