30909161 has 2 divisors, whose sum is σ = 30909162. Its totient is φ = 30909160.

The previous prime is 30909119. The next prime is 30909163. The reversal of 30909161 is 16190903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27825625 + 3083536 = 5275^2 + 1756^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30909161 is a prime.

Together with 30909163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (30909163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15454580 + 15454581.

It is an arithmetic number, because the mean of its divisors is an integer number (15454581).

Almost surely, 2^30909161 is an apocalyptic number.

It is an amenable number.

30909161 is a deficient number, since it is larger than the sum of its proper divisors (1).

30909161 is an equidigital number, since it uses as much as digits as its factorization.

30909161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 30909161 is about 5559.6007950212. The cubic root of 30909161 is about 313.8309264641.

The spelling of 30909161 in words is "thirty million, nine hundred nine thousand, one hundred sixty-one".