19147147 has 2 divisors, whose sum is σ = 19147148. Its totient is φ = 19147146.

The previous prime is 19147133. The next prime is 19147153. The reversal of 19147147 is 74174191.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19147147 is a prime.

It is a super-2 number, since 2×19147147² = 733226476479218, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19147127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9573573 + 9573574.

It is an arithmetic number, because the mean of its divisors is an integer number (9573574).

Almost surely, 2^19147147 is an apocalyptic number.

19147147 is a deficient number, since it is larger than the sum of its proper divisors (1).

19147147 is an equidigital number, since it uses as much as digits as its factorization.

19147147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 34.

The square root of 19147147 is about 4375.7453079447. The cubic root of 19147147 is about 267.5272490948.

The spelling of 19147147 in words is "nineteen million, one hundred forty-seven thousand, one hundred forty-seven".