91447 has 4 divisors (see below), whose sum is σ = 96280. Its totient is φ = 86616.

The previous prime is 91433. The next prime is 91453. The reversal of 91447 is 74419.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91447 - 2¹¹ = 89399 is a prime.

It is a Duffinian number.

91447 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 91447.

It is not an unprimeable number, because it can be changed into a prime (91457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2388 + ... + 2425.

It is an arithmetic number, because the mean of its divisors is an integer number (24070).

2⁹¹⁴⁴⁷ is an apocalyptic number.

91447 is a deficient number, since it is larger than the sum of its proper divisors (4833).

91447 is a wasteful number, since it uses less digits than its factorization.

91447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4832.

The product of its digits is 1008, while the sum is 25.

The square root of 91447 is about 302.4020502576. The cubic root of 91447 is about 45.0529418056.

It can be divided in two parts, 914 and 47, that added together give a square (961 = 31²).

The spelling of 91447 in words is "ninety-one thousand, four hundred forty-seven".