4043560921 has 3 divisors (see below), whose sum is σ = 4043624511. Its totient is φ = 4043497332.

The previous prime is 4043560877. The next prime is 4043560951. The reversal of 4043560921 is 1290653404.

It is a happy number.

The square root of 4043560921 is 63589.

It is a perfect power (a square), and thus also a powerful number.

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 only one way, i.e., 3771310921 + 272250000 = 61411^2 + 16500^2 .

It is not a de Polignac number, because 4043560921 - 2¹³ = 4043552729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4043560951) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 31795 + ... + 95383.

It is an arithmetic number, because the mean of its divisors is an integer number (1347874837).

Almost surely, 2^4043560921 is an apocalyptic number.

4043560921 is the 63589-th square number.

4043560921 is the 31795-th centered octagonal number.

It is an amenable number.

4043560921 is a deficient number, since it is larger than the sum of its proper divisors (63590).

4043560921 is an frugal number, since it uses more digits than its factorization.

4043560921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127178 (or 63589 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The cubic root of 4043560921 is about 1593.1426473549.

The spelling of 4043560921 in words is "four billion, forty-three million, five hundred sixty thousand, nine hundred twenty-one".