91449 has 10 divisors (see below), whose sum is σ = 136730. Its totient is φ = 60912.

The previous prime is 91433. The next prime is 91453. The reversal of 91449 is 94419.

It can be written as a sum of positive squares in only one way, i.e., 59049 + 32400 = 243^2 + 180^2 .

It is not a de Polignac number, because 91449 - 2⁴ = 91433 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (91459) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 484 + ... + 645.

It is an arithmetic number, because the mean of its divisors is an integer number (13673).

2⁹¹⁴⁴⁹ is an apocalyptic number.

91449 is the 162-nd nonagonal number.

It is an amenable number.

91449 is a deficient number, since it is larger than the sum of its proper divisors (45281).

91449 is a wasteful number, since it uses less digits than its factorization.

91449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1141 (or 1132 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 91449 is about 302.4053570954. The cubic root of 91449 is about 45.0532702480.

It can be divided in two parts, 9 and 1449, that multiplied together give a triangular number (13041 = T₁₆₁).

The spelling of 91449 in words is "ninety-one thousand, four hundred forty-nine".