30191947 has 2 divisors, whose sum is σ = 30191948. Its totient is φ = 30191946.

The previous prime is 30191933. The next prime is 30191999. The reversal of 30191947 is 74919103.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30191947 is a prime.

It is not a weakly prime, because it can be changed into another prime (30191647) 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, 15095973 + 15095974.

It is an arithmetic number, because the mean of its divisors is an integer number (15095974).

Almost surely, 2^30191947 is an apocalyptic number.

30191947 is a deficient number, since it is larger than the sum of its proper divisors (1).

30191947 is an equidigital number, since it uses as much as digits as its factorization.

30191947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 30191947 is about 5494.7199200687. The cubic root of 30191947 is about 311.3845355290.

The spelling of 30191947 in words is "thirty million, one hundred ninety-one thousand, nine hundred forty-seven".