45509891 has 16 divisors (see below), whose sum is σ = 53925888. Its totient is φ = 37584000.

The previous prime is 45509873. The next prime is 45509897. The reversal of 45509891 is 19890554.

It is a happy number.

45509891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-45509891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45509897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86756 + ... + 87278.

It is an arithmetic number, because the mean of its divisors is an integer number (3370368).

Almost surely, 2^45509891 is an apocalyptic number.

45509891 is a deficient number, since it is larger than the sum of its proper divisors (8415997).

45509891 is a wasteful number, since it uses less digits than its factorization.

45509891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 962.

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 45509891 is about 6746.1019114745. The cubic root of 45509891 is about 357.0277161250.

It can be divided in two parts, 4550 and 9891, that added together give a palindrome (14441).

The spelling of 45509891 in words is "forty-five million, five hundred nine thousand, eight hundred ninety-one".