30605213 has 2 divisors, whose sum is σ = 30605214. Its totient is φ = 30605212.

The previous prime is 30605209. The next prime is 30605227. The reversal of 30605213 is 31250603.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23059204 + 7546009 = 4802^2 + 2747^2 .

It is a cyclic number.

It is not a de Polignac number, because 30605213 - 2² = 30605209 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30605233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15302606 + 15302607.

It is an arithmetic number, because the mean of its divisors is an integer number (15302607).

Almost surely, 2^30605213 is an apocalyptic number.

It is an amenable number.

30605213 is a deficient number, since it is larger than the sum of its proper divisors (1).

30605213 is an equidigital number, since it uses as much as digits as its factorization.

30605213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 30605213 is about 5532.1978453414. The cubic root of 30605213 is about 312.7988411696.

Adding to 30605213 its reverse (31250603), we get a palindrome (61855816).

The spelling of 30605213 in words is "thirty million, six hundred five thousand, two hundred thirteen".