30905509 has 2 divisors, whose sum is σ = 30905510. Its totient is φ = 30905508.

The previous prime is 30905453. The next prime is 30905527. The reversal of 30905509 is 90550903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25250625 + 5654884 = 5025^2 + 2378^2 .

It is a cyclic number.

It is not a de Polignac number, because 30905509 - 2¹¹ = 30903461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30905579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15452754 + 15452755.

It is an arithmetic number, because the mean of its divisors is an integer number (15452755).

Almost surely, 2^30905509 is an apocalyptic number.

It is an amenable number.

30905509 is a deficient number, since it is larger than the sum of its proper divisors (1).

30905509 is an equidigital number, since it uses as much as digits as its factorization.

30905509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6075, while the sum is 31.

The square root of 30905509 is about 5559.2723444710. The cubic root of 30905509 is about 313.8185659896.

The spelling of 30905509 in words is "thirty million, nine hundred five thousand, five hundred nine".