30525809 has 2 divisors, whose sum is σ = 30525810. Its totient is φ = 30525808.

The previous prime is 30525787. The next prime is 30525821. The reversal of 30525809 is 90852503.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15626209 + 14899600 = 3953^2 + 3860^2 .

It is a cyclic number.

It is not a de Polignac number, because 30525809 - 2⁸ = 30525553 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (30525839) 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, 15262904 + 15262905.

It is an arithmetic number, because the mean of its divisors is an integer number (15262905).

Almost surely, 2^30525809 is an apocalyptic number.

It is an amenable number.

30525809 is a deficient number, since it is larger than the sum of its proper divisors (1).

30525809 is an equidigital number, since it uses as much as digits as its factorization.

30525809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 30525809 is about 5525.0166515586. The cubic root of 30525809 is about 312.5280921946.

The spelling of 30525809 in words is "thirty million, five hundred twenty-five thousand, eight hundred nine".