30506213 has 2 divisors, whose sum is σ = 30506214. Its totient is φ = 30506212.

The previous prime is 30506197. The next prime is 30506219. The reversal of 30506213 is 31260503.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21548164 + 8958049 = 4642^2 + 2993^2 .

It is a cyclic number.

It is not a de Polignac number, because 30506213 - 2⁴ = 30506197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30506219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15253106 + 15253107.

It is an arithmetic number, because the mean of its divisors is an integer number (15253107).

Almost surely, 2^30506213 is an apocalyptic number.

It is an amenable number.

30506213 is a deficient number, since it is larger than the sum of its proper divisors (1).

30506213 is an equidigital number, since it uses as much as digits as its factorization.

30506213 is an odious number, because the sum of its binary digits is odd.

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

The square root of 30506213 is about 5523.2429785408. The cubic root of 30506213 is about 312.4612022233.

Adding to 30506213 its reverse (31260503), we get a palindrome (61766716).

The spelling of 30506213 in words is "thirty million, five hundred six thousand, two hundred thirteen".