30640913 has 2 divisors, whose sum is σ = 30640914. Its totient is φ = 30640912.

The previous prime is 30640891. The next prime is 30640931. The reversal of 30640913 is 31904603.

Together with next prime (30640931) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23116864 + 7524049 = 4808^2 + 2743^2 .

It is an emirp because it is prime and its reverse (31904603) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30640913 - 2⁸ = 30640657 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 (30640933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15320456 + 15320457.

It is an arithmetic number, because the mean of its divisors is an integer number (15320457).

Almost surely, 2^30640913 is an apocalyptic number.

It is an amenable number.

30640913 is a deficient number, since it is larger than the sum of its proper divisors (1).

30640913 is an equidigital number, since it uses as much as digits as its factorization.

30640913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 30640913 is about 5535.4234707021. The cubic root of 30640913 is about 312.9204171844.

The spelling of 30640913 in words is "thirty million, six hundred forty thousand, nine hundred thirteen".