30889213 has 2 divisors, whose sum is σ = 30889214. Its totient is φ = 30889212.

The previous prime is 30889181. The next prime is 30889219. The reversal of 30889213 is 31298803.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21780889 + 9108324 = 4667^2 + 3018^2 .

It is a cyclic number.

It is not a de Polignac number, because 30889213 - 2⁵ = 30889181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30889219) 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, 15444606 + 15444607.

It is an arithmetic number, because the mean of its divisors is an integer number (15444607).

Almost surely, 2^30889213 is an apocalyptic number.

It is an amenable number.

30889213 is a deficient number, since it is larger than the sum of its proper divisors (1).

30889213 is an equidigital number, since it uses as much as digits as its factorization.

30889213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 30889213 is about 5557.8064917735. The cubic root of 30889213 is about 313.7633990563.

The spelling of 30889213 in words is "thirty million, eight hundred eighty-nine thousand, two hundred thirteen".