449809891 has 4 divisors (see below), whose sum is σ = 450063952. Its totient is φ = 449555832.

The previous prime is 449809883. The next prime is 449809909. The reversal of 449809891 is 198908944.

It is a happy number.

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 449809891 - 2³ = 449809883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (449809831) 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, 124356 + ... + 127921.

It is an arithmetic number, because the mean of its divisors is an integer number (112515988).

Almost surely, 2^449809891 is an apocalyptic number.

449809891 is a deficient number, since it is larger than the sum of its proper divisors (254061).

449809891 is a wasteful number, since it uses less digits than its factorization.

449809891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254060.

The product of its (nonzero) digits is 746496, while the sum is 52.

The square root of 449809891 is about 21208.7220501378. The cubic root of 449809891 is about 766.2015043640.

The spelling of 449809891 in words is "four hundred forty-nine million, eight hundred nine thousand, eight hundred ninety-one".