91517147 has 2 divisors, whose sum is σ = 91517148. Its totient is φ = 91517146.

The previous prime is 91517143. The next prime is 91517149. The reversal of 91517147 is 74171519.

It is a strong prime.

It is an emirp because it is prime and its reverse (74171519) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91517147 - 2² = 91517143 is a prime.

Together with 91517149, 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 (91517143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45758573 + 45758574.

It is an arithmetic number, because the mean of its divisors is an integer number (45758574).

Almost surely, 2^91517147 is an apocalyptic number.

91517147 is a deficient number, since it is larger than the sum of its proper divisors (1).

91517147 is an equidigital number, since it uses as much as digits as its factorization.

91517147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8820, while the sum is 35.

The square root of 91517147 is about 9566.4594809156. The cubic root of 91517147 is about 450.6445857114.

The spelling of 91517147 in words is "ninety-one million, five hundred seventeen thousand, one hundred forty-seven".