4066521 has 4 divisors (see below), whose sum is σ = 5422032. Its totient is φ = 2711012.

The previous prime is 4066507. The next prime is 4066523. The reversal of 4066521 is 1256604.

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 4066521 - 2¹⁵ = 4033753 is a prime.

It is an Ulam number.

It is a D-number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 4066491 and 4066500.

It is not an unprimeable number, because it can be changed into a prime (4066523) 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, 677751 + ... + 677756.

It is an arithmetic number, because the mean of its divisors is an integer number (1355508).

Almost surely, 2^4066521 is an apocalyptic number.

It is an amenable number.

4066521 is a deficient number, since it is larger than the sum of its proper divisors (1355511).

4066521 is a wasteful number, since it uses less digits than its factorization.

4066521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355510.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 4066521 is about 2016.5616777079. The cubic root of 4066521 is about 159.6152343169.

The spelling of 4066521 in words is "four million, sixty-six thousand, five hundred twenty-one".