5118821 has 2 divisors, whose sum is σ = 5118822. Its totient is φ = 5118820.

The previous prime is 5118779. The next prime is 5118829. The reversal of 5118821 is 1288115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4669921 + 448900 = 2161^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 5118821 - 2¹⁰ = 5117797 is a prime.

It is a Chen prime.

It is an Ulam number.

It is equal to p₃₅₆₁₆₅ and since 5118821 and 356165 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5118829) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2559410 + 2559411.

It is an arithmetic number, because the mean of its divisors is an integer number (2559411).

Almost surely, 2^5118821 is an apocalyptic number.

It is an amenable number.

5118821 is a deficient number, since it is larger than the sum of its proper divisors (1).

5118821 is an equidigital number, since it uses as much as digits as its factorization.

5118821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 640, while the sum is 26.

The square root of 5118821 is about 2262.4811601426. The cubic root of 5118821 is about 172.3415446114.

The spelling of 5118821 in words is "five million, one hundred eighteen thousand, eight hundred twenty-one".