30665993 has 2 divisors, whose sum is σ = 30665994. Its totient is φ = 30665992.

The previous prime is 30665953. The next prime is 30666001. The reversal of 30665993 is 39956603.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24127744 + 6538249 = 4912^2 + 2557^2 .

It is an emirp because it is prime and its reverse (39956603) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30665993 - 2¹⁰ = 30664969 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 30665993.

It is not a weakly prime, because it can be changed into another prime (30665953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15332996 + 15332997.

It is an arithmetic number, because the mean of its divisors is an integer number (15332997).

Almost surely, 2^30665993 is an apocalyptic number.

It is an amenable number.

30665993 is a deficient number, since it is larger than the sum of its proper divisors (1).

30665993 is an equidigital number, since it uses as much as digits as its factorization.

30665993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 131220, while the sum is 41.

The square root of 30665993 is about 5537.6884166591. The cubic root of 30665993 is about 313.0057704265.

The spelling of 30665993 in words is "thirty million, six hundred sixty-five thousand, nine hundred ninety-three".