5555721 has 4 divisors (see below), whose sum is σ = 7407632. Its totient is φ = 3703812.

The previous prime is 5555701. The next prime is 5555723. The reversal of 5555721 is 1275555.

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 5555721 - 2⁵ = 5555689 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5555723) 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, 925951 + ... + 925956.

It is an arithmetic number, because the mean of its divisors is an integer number (1851908).

Almost surely, 2^5555721 is an apocalyptic number.

It is an amenable number.

5555721 is a deficient number, since it is larger than the sum of its proper divisors (1851911).

5555721 is a wasteful number, since it uses less digits than its factorization.

5555721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1851910.

The product of its digits is 8750, while the sum is 30.

The square root of 5555721 is about 2357.0576997604. The cubic root of 5555721 is about 177.1115196225. Note that the first 3 decimals are identical.

The spelling of 5555721 in words is "five million, five hundred fifty-five thousand, seven hundred twenty-one".