449665891 has 2 divisors, whose sum is σ = 449665892. Its totient is φ = 449665890.

The previous prime is 449665883. The next prime is 449665903. The reversal of 449665891 is 198566944.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 449665891 - 2³ = 449665883 is a prime.

It is not a weakly prime, because it can be changed into another prime (449665841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 224832945 + 224832946.

It is an arithmetic number, because the mean of its divisors is an integer number (224832946).

Almost surely, 2^449665891 is an apocalyptic number.

449665891 is a deficient number, since it is larger than the sum of its proper divisors (1).

449665891 is an equidigital number, since it uses as much as digits as its factorization.

449665891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 52.

The square root of 449665891 is about 21205.3269486702. The cubic root of 449665891 is about 766.1197329351.

The spelling of 449665891 in words is "four hundred forty-nine million, six hundred sixty-five thousand, eight hundred ninety-one".