445840091 has 4 divisors (see below), whose sum is σ = 446004792. Its totient is φ = 445675392.

The previous prime is 445840063. The next prime is 445840097. The reversal of 445840091 is 190048544.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-445840091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (445840097) 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, 78221 + ... + 83726.

It is an arithmetic number, because the mean of its divisors is an integer number (111501198).

Almost surely, 2^445840091 is an apocalyptic number.

445840091 is a deficient number, since it is larger than the sum of its proper divisors (164701).

445840091 is a wasteful number, since it uses less digits than its factorization.

445840091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164700.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 445840091 is about 21114.9257872245. The cubic root of 445840091 is about 763.9408019289.

The spelling of 445840091 in words is "four hundred forty-five million, eight hundred forty thousand, ninety-one".