191315147 has 2 divisors, whose sum is σ = 191315148. Its totient is φ = 191315146.

The previous prime is 191315141. The next prime is 191315149. The reversal of 191315147 is 741513191.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 191315147 - 2¹⁸ = 191053003 is a prime.

Together with 191315149, 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 (191315141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95657573 + 95657574.

It is an arithmetic number, because the mean of its divisors is an integer number (95657574).

Almost surely, 2^191315147 is an apocalyptic number.

191315147 is a deficient number, since it is larger than the sum of its proper divisors (1).

191315147 is an equidigital number, since it uses as much as digits as its factorization.

191315147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 32.

The square root of 191315147 is about 13831.6718801452. The cubic root of 191315147 is about 576.2130880753.

The spelling of 191315147 in words is "one hundred ninety-one million, three hundred fifteen thousand, one hundred forty-seven".