45555821 has 4 divisors (see below), whose sum is σ = 45569532. Its totient is φ = 45542112.

The previous prime is 45555817. The next prime is 45555823. The reversal of 45555821 is 12855554.

45555821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 18826921 + 26728900 = 4339^2 + 5170^2 .

It is a cyclic number.

It is not a de Polignac number, because 45555821 - 2² = 45555817 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 (45555823) 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 3 ways as a sum of consecutive naturals, for example, 1631 + ... + 9683.

It is an arithmetic number, because the mean of its divisors is an integer number (11392383).

Almost surely, 2^45555821 is an apocalyptic number.

It is an amenable number.

45555821 is a deficient number, since it is larger than the sum of its proper divisors (13711).

45555821 is an equidigital number, since it uses as much as digits as its factorization.

45555821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13710.

The product of its digits is 40000, while the sum is 35.

The square root of 45555821 is about 6749.5052411269. The cubic root of 45555821 is about 357.1477835739.

The spelling of 45555821 in words is "forty-five million, five hundred fifty-five thousand, eight hundred twenty-one".