449805991 has 4 divisors (see below), whose sum is σ = 449943184. Its totient is φ = 449668800.

The previous prime is 449805989. The next prime is 449806051. The reversal of 449805991 is 199508944.

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 449805991 - 2¹ = 449805989 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 (449805931) 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, 63555 + ... + 70276.

It is an arithmetic number, because the mean of its divisors is an integer number (112485796).

Almost surely, 2^449805991 is an apocalyptic number.

449805991 is a deficient number, since it is larger than the sum of its proper divisors (137193).

449805991 is a wasteful number, since it uses less digits than its factorization.

449805991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137192.

The product of its (nonzero) digits is 466560, while the sum is 49.

The square root of 449805991 is about 21208.6301066335. The cubic root of 449805991 is about 766.1992899511.

The spelling of 449805991 in words is "four hundred forty-nine million, eight hundred five thousand, nine hundred ninety-one".