91544 has 8 divisors (see below), whose sum is σ = 171660. Its totient is φ = 45768.

The previous prime is 91541. The next prime is 91571. The reversal of 91544 is 44519.

91544 = 68² + 69² + ... + 83².

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5714 + ... + 5729.

2⁹¹⁵⁴⁴ is an apocalyptic number.

It is an amenable number.

91544 is a deficient number, since it is larger than the sum of its proper divisors (80116).

91544 is a wasteful number, since it uses less digits than its factorization.

91544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11449 (or 11445 counting only the distinct ones).

The product of its digits is 720, while the sum is 23.

The square root of 91544 is about 302.5623902603. The cubic root of 91544 is about 45.0688657510.

It can be divided in two parts, 915 and 44, that added together give a palindrome (959).

The spelling of 91544 in words is "ninety-one thousand, five hundred forty-four".