445553821 has 8 divisors (see below), whose sum is σ = 459066104. Its totient is φ = 432241920.

The previous prime is 445553803. The next prime is 445553827. The reversal of 445553821 is 128355544.

It can be written as a sum of positive squares in 4 ways, for example, as 5812921 + 439740900 = 2411^2 + 20970^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 445553821 - 2⁵ = 445553789 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 (445553827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45576 + ... + 54481.

It is an arithmetic number, because the mean of its divisors is an integer number (57383263).

Almost surely, 2^445553821 is an apocalyptic number.

It is an amenable number.

445553821 is a deficient number, since it is larger than the sum of its proper divisors (13512283).

445553821 is a wasteful number, since it uses less digits than its factorization.

445553821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100191.

The product of its digits is 96000, while the sum is 37.

The square root of 445553821 is about 21108.1458446733. The cubic root of 445553821 is about 763.7772603651. Note that the first 3 decimals are identical.

The spelling of 445553821 in words is "four hundred forty-five million, five hundred fifty-three thousand, eight hundred twenty-one".