5155221 has 4 divisors (see below), whose sum is σ = 6873632. Its totient is φ = 3436812.

The previous prime is 5155219. The next prime is 5155229. The reversal of 5155221 is 1225515.

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 5155221 - 2¹ = 5155219 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5155229) 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, 859201 + ... + 859206.

It is an arithmetic number, because the mean of its divisors is an integer number (1718408).

Almost surely, 2^5155221 is an apocalyptic number.

It is an amenable number.

5155221 is a deficient number, since it is larger than the sum of its proper divisors (1718411).

5155221 is a wasteful number, since it uses less digits than its factorization.

5155221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1718410.

The product of its digits is 500, while the sum is 21.

The square root of 5155221 is about 2270.5111759249. The cubic root of 5155221 is about 172.7490877425.

The spelling of 5155221 in words is "five million, one hundred fifty-five thousand, two hundred twenty-one".