91549 has 4 divisors (see below), whose sum is σ = 92736. Its totient is φ = 90364.

The previous prime is 91541. The next prime is 91571. The reversal of 91549 is 94519.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94519 = 31 ⋅3049.

It is a cyclic number.

It is not a de Polignac number, because 91549 - 2³ = 91541 is a prime.

It is a Duffinian number.

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 in 3 ways as a sum of consecutive naturals, for example, 469 + ... + 634.

It is an arithmetic number, because the mean of its divisors is an integer number (23184).

2⁹¹⁵⁴⁹ is an apocalyptic number.

It is an amenable number.

91549 is a deficient number, since it is larger than the sum of its proper divisors (1187).

91549 is a wasteful number, since it uses less digits than its factorization.

91549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1186.

The product of its digits is 1620, while the sum is 28.

The square root of 91549 is about 302.5706529061. The cubic root of 91549 is about 45.0696862680.

The spelling of 91549 in words is "ninety-one thousand, five hundred forty-nine".