4056521 has 4 divisors (see below), whose sum is σ = 4636032. Its totient is φ = 3477012.

The previous prime is 4056517. The next prime is 4056527. The reversal of 4056521 is 1256504.

Added to its reverse (1256504) it gives a square (5313025 = 2305²).

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 4056521 - 2² = 4056517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4056527) 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, 289745 + ... + 289758.

It is an arithmetic number, because the mean of its divisors is an integer number (1159008).

Almost surely, 2^4056521 is an apocalyptic number.

It is an amenable number.

4056521 is a deficient number, since it is larger than the sum of its proper divisors (579511).

4056521 is an equidigital number, since it uses as much as digits as its factorization.

4056521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579510.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 4056521 is about 2014.0806835874. The cubic root of 4056521 is about 159.4842900772.

Adding to 4056521 its reverse (1256504), we get a square (5313025 = 2305²).

The spelling of 4056521 in words is "four million, fifty-six thousand, five hundred twenty-one".