4045521 has 4 divisors (see below), whose sum is σ = 5394032. Its totient is φ = 2697012.

The previous prime is 4045501. The next prime is 4045523. The reversal of 4045521 is 1255404.

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 not a de Polignac number, because 4045521 - 2⁹ = 4045009 is a prime.

It is a super-2 number, since 2×4045521² = 32732480322882, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4045523) 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, 674251 + ... + 674256.

It is an arithmetic number, because the mean of its divisors is an integer number (1348508).

Almost surely, 2^4045521 is an apocalyptic number.

It is an amenable number.

4045521 is a deficient number, since it is larger than the sum of its proper divisors (1348511).

4045521 is a wasteful number, since it uses less digits than its factorization.

4045521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1348510.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 4045521 is about 2011.3480554096. The cubic root of 4045521 is about 159.3400026192.

The spelling of 4045521 in words is "four million, forty-five thousand, five hundred twenty-one".