30996209 has 2 divisors, whose sum is σ = 30996210. Its totient is φ = 30996208.

The previous prime is 30996197. The next prime is 30996233. The reversal of 30996209 is 90269903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17098225 + 13897984 = 4135^2 + 3728^2 .

It is a cyclic number.

It is not a de Polignac number, because 30996209 - 2⁸ = 30995953 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (30996109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15498104 + 15498105.

It is an arithmetic number, because the mean of its divisors is an integer number (15498105).

Almost surely, 2^30996209 is an apocalyptic number.

It is an amenable number.

30996209 is a deficient number, since it is larger than the sum of its proper divisors (1).

30996209 is an equidigital number, since it uses as much as digits as its factorization.

30996209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 30996209 is about 5567.4239105712. The cubic root of 30996209 is about 314.1252593687.

The spelling of 30996209 in words is "thirty million, nine hundred ninety-six thousand, two hundred nine".