5156215817 has 2 divisors, whose sum is σ = 5156215818. Its totient is φ = 5156215816.

The previous prime is 5156215781. The next prime is 5156215837. The reversal of 5156215817 is 7185126515.

5156215817 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (5156215781) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4853072896 + 303142921 = 69664^2 + 17411^2 .

It is a cyclic number.

It is not a de Polignac number, because 5156215817 - 2¹⁰ = 5156214793 is a prime.

It is not a weakly prime, because it can be changed into another prime (5156215837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2578107908 + 2578107909.

It is an arithmetic number, because the mean of its divisors is an integer number (2578107909).

Almost surely, 2^5156215817 is an apocalyptic number.

It is an amenable number.

5156215817 is a deficient number, since it is larger than the sum of its proper divisors (1).

5156215817 is an equidigital number, since it uses as much as digits as its factorization.

5156215817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84000, while the sum is 41.

The square root of 5156215817 is about 71806.7950614703. The cubic root of 5156215817 is about 1727.6019898136.

The spelling of 5156215817 in words is "five billion, one hundred fifty-six million, two hundred fifteen thousand, eight hundred seventeen".