30491147 has 2 divisors, whose sum is σ = 30491148. Its totient is φ = 30491146.

The previous prime is 30491137. The next prime is 30491161. The reversal of 30491147 is 74119403.

It is a weak prime.

It is an emirp because it is prime and its reverse (74119403) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30491147 - 2⁸ = 30490891 is a prime.

It is not a weakly prime, because it can be changed into another prime (30491137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15245573 + 15245574.

It is an arithmetic number, because the mean of its divisors is an integer number (15245574).

Almost surely, 2^30491147 is an apocalyptic number.

30491147 is a deficient number, since it is larger than the sum of its proper divisors (1).

30491147 is an equidigital number, since it uses as much as digits as its factorization.

30491147 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 30491147 is about 5521.8789374632. The cubic root of 30491147 is about 312.4097557016.

The spelling of 30491147 in words is "thirty million, four hundred ninety-one thousand, one hundred forty-seven".