5115501221 has 4 divisors (see below), whose sum is σ = 5118064812. Its totient is φ = 5112937632.

The previous prime is 5115501217. The next prime is 5115501247. The reversal of 5115501221 is 1221055115.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1407300196 + 3708201025 = 37514^2 + 60895^2 .

It is a cyclic number.

It is not a de Polignac number, because 5115501221 - 2² = 5115501217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5115501421) 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, 1278800 + ... + 1282793.

It is an arithmetic number, because the mean of its divisors is an integer number (1279516203).

Almost surely, 2^5115501221 is an apocalyptic number.

It is an amenable number.

5115501221 is a deficient number, since it is larger than the sum of its proper divisors (2563591).

5115501221 is a wasteful number, since it uses less digits than its factorization.

5115501221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2563590.

The product of its (nonzero) digits is 500, while the sum is 23.

The square root of 5115501221 is about 71522.7321975328. The cubic root of 5115501221 is about 1723.0427954784.

Adding to 5115501221 its reverse (1221055115), we get a palindrome (6336556336).

The spelling of 5115501221 in words is "five billion, one hundred fifteen million, five hundred one thousand, two hundred twenty-one".