30509989 has 2 divisors, whose sum is σ = 30509990. Its totient is φ = 30509988.

The previous prime is 30509987. The next prime is 30510041. The reversal of 30509989 is 98990503.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17850625 + 12659364 = 4225^2 + 3558^2 .

It is a cyclic number.

It is not a de Polignac number, because 30509989 - 2¹ = 30509987 is a prime.

Together with 30509987, it forms a pair of twin primes.

It is equal to p_1887496 and since 30509989 and 1887496 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30509987) 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, 15254994 + 15254995.

It is an arithmetic number, because the mean of its divisors is an integer number (15254995).

Almost surely, 2^30509989 is an apocalyptic number.

It is an amenable number.

30509989 is a deficient number, since it is larger than the sum of its proper divisors (1).

30509989 is an equidigital number, since it uses as much as digits as its factorization.

30509989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 30509989 is about 5523.5847961265. The cubic root of 30509989 is about 312.4740936391.

The spelling of 30509989 in words is "thirty million, five hundred nine thousand, nine hundred eighty-nine".