30491609 has 2 divisors, whose sum is σ = 30491610. Its totient is φ = 30491608.

The previous prime is 30491603. The next prime is 30491647. The reversal of 30491609 is 90619403.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26491609 + 4000000 = 5147^2 + 2000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30491609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (30491603) 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, 15245804 + 15245805.

It is an arithmetic number, because the mean of its divisors is an integer number (15245805).

Almost surely, 2^30491609 is an apocalyptic number.

It is an amenable number.

30491609 is a deficient number, since it is larger than the sum of its proper divisors (1).

30491609 is an equidigital number, since it uses as much as digits as its factorization.

30491609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 30491609 is about 5521.9207708912. The cubic root of 30491609 is about 312.4113335648.

The spelling of 30491609 in words is "thirty million, four hundred ninety-one thousand, six hundred nine".