445991169 has 12 divisors (see below), whose sum is σ = 643916976. Its totient is φ = 274455792.

The previous prime is 445991167. The next prime is 445991173. The reversal of 445991169 is 961199544.

It is a happy number.

It is not a de Polignac number, because 445991169 - 2¹ = 445991167 is a prime.

It is a super-2 number, since 2×445991169² = 397816245651973122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (445991167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 439327 + ... + 440340.

It is an arithmetic number, because the mean of its divisors is an integer number (53659748).

Almost surely, 2^445991169 is an apocalyptic number.

It is an amenable number.

445991169 is a deficient number, since it is larger than the sum of its proper divisors (197925807).

445991169 is a wasteful number, since it uses less digits than its factorization.

445991169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879696 (or 879683 counting only the distinct ones).

The product of its digits is 349920, while the sum is 48.

The square root of 445991169 is about 21118.5030009231. The cubic root of 445991169 is about 764.0270822020.

The spelling of 445991169 in words is "four hundred forty-five million, nine hundred ninety-one thousand, one hundred sixty-nine".