91197247 has 2 divisors, whose sum is σ = 91197248. Its totient is φ = 91197246.

The previous prime is 91197229. The next prime is 91197263. The reversal of 91197247 is 74279119.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91197247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91197217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45598623 + 45598624.

It is an arithmetic number, because the mean of its divisors is an integer number (45598624).

Almost surely, 2^91197247 is an apocalyptic number.

91197247 is a deficient number, since it is larger than the sum of its proper divisors (1).

91197247 is an equidigital number, since it uses as much as digits as its factorization.

91197247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 40.

The square root of 91197247 is about 9549.7249698617. The cubic root of 91197247 is about 450.1188936874.

The spelling of 91197247 in words is "ninety-one million, one hundred ninety-seven thousand, two hundred forty-seven".