30913213 has 2 divisors, whose sum is σ = 30913214. Its totient is φ = 30913212.

The previous prime is 30913177. The next prime is 30913261. The reversal of 30913213 is 31231903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28164249 + 2748964 = 5307^2 + 1658^2 .

It is an emirp because it is prime and its reverse (31231903) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30913213 - 2⁹ = 30912701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30913273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15456606 + 15456607.

It is an arithmetic number, because the mean of its divisors is an integer number (15456607).

Almost surely, 2^30913213 is an apocalyptic number.

It is an amenable number.

30913213 is a deficient number, since it is larger than the sum of its proper divisors (1).

30913213 is an equidigital number, since it uses as much as digits as its factorization.

30913213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 30913213 is about 5559.9651977328. The cubic root of 30913213 is about 313.8446396299.

The spelling of 30913213 in words is "thirty million, nine hundred thirteen thousand, two hundred thirteen".