91448647 has 2 divisors, whose sum is σ = 91448648. Its totient is φ = 91448646.

The previous prime is 91448597. The next prime is 91448663. The reversal of 91448647 is 74684419.

It is a strong prime.

It is an emirp because it is prime and its reverse (74684419) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91448647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91488647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45724323 + 45724324.

It is an arithmetic number, because the mean of its divisors is an integer number (45724324).

Almost surely, 2^91448647 is an apocalyptic number.

91448647 is a deficient number, since it is larger than the sum of its proper divisors (1).

91448647 is an equidigital number, since it uses as much as digits as its factorization.

91448647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 43.

The square root of 91448647 is about 9562.8785938126. The cubic root of 91448647 is about 450.5321227828.

The spelling of 91448647 in words is "ninety-one million, four hundred forty-eight thousand, six hundred forty-seven".