30505513 has 4 divisors (see below), whose sum is σ = 30516948. Its totient is φ = 30494080.

The previous prime is 30505499. The next prime is 30505529. The reversal of 30505513 is 31550503.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 17197609 + 13307904 = 4147^2 + 3648^2 .

It is a cyclic number.

It is not a de Polignac number, because 30505513 - 2⁵ = 30505481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30505543) 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 in 3 ways as a sum of consecutive naturals, for example, 645 + ... + 7837.

It is an arithmetic number, because the mean of its divisors is an integer number (7629237).

Almost surely, 2^30505513 is an apocalyptic number.

It is an amenable number.

30505513 is a deficient number, since it is larger than the sum of its proper divisors (11435).

30505513 is an equidigital number, since it uses as much as digits as its factorization.

30505513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11434.

The product of its (nonzero) digits is 1125, while the sum is 22.

The square root of 30505513 is about 5523.1796096089. The cubic root of 30505513 is about 312.4588122783.

The spelling of 30505513 in words is "thirty million, five hundred five thousand, five hundred thirteen".