30513809 has 2 divisors, whose sum is σ = 30513810. Its totient is φ = 30513808.

The previous prime is 30513803. The next prime is 30513811. The reversal of 30513809 is 90831503.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29463184 + 1050625 = 5428^2 + 1025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30513809 is a prime.

It is a Sophie Germain prime.

Together with 30513811, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (30513803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15256904 + 15256905.

It is an arithmetic number, because the mean of its divisors is an integer number (15256905).

Almost surely, 2^30513809 is an apocalyptic number.

It is an amenable number.

30513809 is a deficient number, since it is larger than the sum of its proper divisors (1).

30513809 is an equidigital number, since it uses as much as digits as its factorization.

30513809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 30513809 is about 5523.9305752335. The cubic root of 30513809 is about 312.4871341903.

The spelling of 30513809 in words is "thirty million, five hundred thirteen thousand, eight hundred nine".