45443821 has 4 divisors (see below), whose sum is σ = 45912412. Its totient is φ = 44975232.

The previous prime is 45443809. The next prime is 45443831. The reversal of 45443821 is 12834454.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12834454 = 2 ⋅6417227.

It can be written as a sum of positive squares in 2 ways, for example, as 16402500 + 29041321 = 4050^2 + 5389^2 .

It is a cyclic number.

It is not a de Polignac number, because 45443821 - 2⁷ = 45443693 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 (45443831) 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, 234150 + ... + 234343.

It is an arithmetic number, because the mean of its divisors is an integer number (11478103).

Almost surely, 2^45443821 is an apocalyptic number.

It is an amenable number.

45443821 is a deficient number, since it is larger than the sum of its proper divisors (468591).

45443821 is an equidigital number, since it uses as much as digits as its factorization.

45443821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468590.

The product of its digits is 15360, while the sum is 31.

The square root of 45443821 is about 6741.2032308780. The cubic root of 45443821 is about 356.8548581294.

It can be divided in two parts, 45443 and 821, that added together give a palindrome (46264).

The spelling of 45443821 in words is "forty-five million, four hundred forty-three thousand, eight hundred twenty-one".