91247 has 4 divisors (see below), whose sum is σ = 98280. Its totient is φ = 84216.

The previous prime is 91243. The next prime is 91249. The reversal of 91247 is 74219.

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 91247 - 2² = 91243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91243) 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, 3497 + ... + 3522.

It is an arithmetic number, because the mean of its divisors is an integer number (24570).

2⁹¹²⁴⁷ is an apocalyptic number.

91247 is a deficient number, since it is larger than the sum of its proper divisors (7033).

91247 is a wasteful number, since it uses less digits than its factorization.

91247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7032.

The product of its digits is 504, while the sum is 23.

The square root of 91247 is about 302.0711836637. The cubic root of 91247 is about 45.0200733490.

It can be divided in two parts, 912 and 47, that added together give a palindrome (959).

The spelling of 91247 in words is "ninety-one thousand, two hundred forty-seven".