5565721 has 4 divisors (see below), whose sum is σ = 6360832. Its totient is φ = 4770612.

The previous prime is 5565719. The next prime is 5565733. The reversal of 5565721 is 1275655.

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 5565721 - 2¹ = 5565719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5565121) 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, 397545 + ... + 397558.

It is an arithmetic number, because the mean of its divisors is an integer number (1590208).

Almost surely, 2^5565721 is an apocalyptic number.

It is an amenable number.

5565721 is a deficient number, since it is larger than the sum of its proper divisors (795111).

5565721 is an equidigital number, since it uses as much as digits as its factorization.

5565721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795110.

The product of its digits is 10500, while the sum is 31.

The square root of 5565721 is about 2359.1780348248. The cubic root of 5565721 is about 177.2177196771.

The spelling of 5565721 in words is "five million, five hundred sixty-five thousand, seven hundred twenty-one".