5556721 has 4 divisors (see below), whose sum is σ = 5849200. Its totient is φ = 5264244.

The previous prime is 5556713. The next prime is 5556743. The reversal of 5556721 is 1276555.

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 5556721 - 2³ = 5556713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5556751) 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, 146211 + ... + 146248.

It is an arithmetic number, because the mean of its divisors is an integer number (1462300).

Almost surely, 2^5556721 is an apocalyptic number.

It is an amenable number.

5556721 is a deficient number, since it is larger than the sum of its proper divisors (292479).

5556721 is a wasteful number, since it uses less digits than its factorization.

5556721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292478.

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

The square root of 5556721 is about 2357.2698190916. The cubic root of 5556721 is about 177.1221453598.

The spelling of 5556721 in words is "five million, five hundred fifty-six thousand, seven hundred twenty-one".