30889909 has 2 divisors, whose sum is σ = 30889910. Its totient is φ = 30889908.

The previous prime is 30889891. The next prime is 30889921. The reversal of 30889909 is 90998803.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30747025 + 142884 = 5545^2 + 378^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30889909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30889939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15444954 + 15444955.

It is an arithmetic number, because the mean of its divisors is an integer number (15444955).

Almost surely, 2^30889909 is an apocalyptic number.

It is an amenable number.

30889909 is a deficient number, since it is larger than the sum of its proper divisors (1).

30889909 is an equidigital number, since it uses as much as digits as its factorization.

30889909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 30889909 is about 5557.8691060513. The cubic root of 30889909 is about 313.7657556253.

The spelling of 30889909 in words is "thirty million, eight hundred eighty-nine thousand, nine hundred nine".