450091 has 4 divisors (see below), whose sum is σ = 473800. Its totient is φ = 426384.

The previous prime is 450083. The next prime is 450101. The reversal of 450091 is 190054.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190054 = 2 ⋅95027.

It is a cyclic number.

It is not a de Polignac number, because 450091 - 2³ = 450083 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 23689 = 450091 / (4 + 5 + 0 + 0 + 9 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (450001) 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, 11826 + ... + 11863.

It is an arithmetic number, because the mean of its divisors is an integer number (118450).

2⁴⁵⁰⁰⁹¹ is an apocalyptic number.

450091 is a deficient number, since it is larger than the sum of its proper divisors (23709).

450091 is a wasteful number, since it uses less digits than its factorization.

450091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23708.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 450091 is about 670.8882172165. Note that the first 3 decimals coincide. The cubic root of 450091 is about 76.6361083844.

The spelling of 450091 in words is "four hundred fifty thousand, ninety-one".