30512809 has 2 divisors, whose sum is σ = 30512810. Its totient is φ = 30512808.

The previous prime is 30512791. The next prime is 30512813. The reversal of 30512809 is 90821503.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29942784 + 570025 = 5472^2 + 755^2 .

It is a cyclic number.

It is not a de Polignac number, because 30512809 - 2¹¹ = 30510761 is a prime.

It is not a weakly prime, because it can be changed into another prime (30512819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15256404 + 15256405.

It is an arithmetic number, because the mean of its divisors is an integer number (15256405).

Almost surely, 2^30512809 is an apocalyptic number.

It is an amenable number.

30512809 is a deficient number, since it is larger than the sum of its proper divisors (1).

30512809 is an equidigital number, since it uses as much as digits as its factorization.

30512809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 30512809 is about 5523.8400592342. The cubic root of 30512809 is about 312.4837205386.

The spelling of 30512809 in words is "thirty million, five hundred twelve thousand, eight hundred nine".