5218729 has 2 divisors, whose sum is σ = 5218730. Its totient is φ = 5218728.

The previous prime is 5218721. The next prime is 5218793. The reversal of 5218729 is 9278125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2968729 + 2250000 = 1723^2 + 1500^2 .

It is a cyclic number.

It is not a de Polignac number, because 5218729 - 2³ = 5218721 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 5218694 and 5218703.

It is not a weakly prime, because it can be changed into another prime (5218721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2609364 + 2609365.

It is an arithmetic number, because the mean of its divisors is an integer number (2609365).

Almost surely, 2^5218729 is an apocalyptic number.

It is an amenable number.

5218729 is a deficient number, since it is larger than the sum of its proper divisors (1).

5218729 is an equidigital number, since it uses as much as digits as its factorization.

5218729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 34.

The square root of 5218729 is about 2284.4537640320. The cubic root of 5218729 is about 173.4555691858.

It can be divided in two parts, 52 and 18729, that added together give a palindrome (18781).

The spelling of 5218729 in words is "five million, two hundred eighteen thousand, seven hundred twenty-nine".