2045544421 has 4 divisors (see below), whose sum is σ = 2046675744. Its totient is φ = 2044413100.

The previous prime is 2045544373. The next prime is 2045544437. The reversal of 2045544421 is 1244455402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2045544421 - 2²¹ = 2043447269 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2045544121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 562945 + ... + 566566.

It is an arithmetic number, because the mean of its divisors is an integer number (511668936).

Almost surely, 2^2045544421 is an apocalyptic number.

It is an amenable number.

2045544421 is a deficient number, since it is larger than the sum of its proper divisors (1131323).

2045544421 is a wasteful number, since it uses less digits than its factorization.

2045544421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131322.

The product of its (nonzero) digits is 25600, while the sum is 31.

The square root of 2045544421 is about 45227.6952872905. The cubic root of 2045544421 is about 1269.4130879756.

Adding to 2045544421 its reverse (1244455402), we get a palindrome (3289999823).

The spelling of 2045544421 in words is "two billion, forty-five million, five hundred forty-four thousand, four hundred twenty-one".