5185578217 has 2 divisors, whose sum is σ = 5185578218. Its totient is φ = 5185578216.

The previous prime is 5185578191. The next prime is 5185578257. The reversal of 5185578217 is 7128755815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4886149801 + 299428416 = 69901^2 + 17304^2 .

It is a cyclic number.

It is not a de Polignac number, because 5185578217 - 2⁷ = 5185578089 is a prime.

It is not a weakly prime, because it can be changed into another prime (5185578257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2592789108 + 2592789109.

It is an arithmetic number, because the mean of its divisors is an integer number (2592789109).

Almost surely, 2^5185578217 is an apocalyptic number.

It is an amenable number.

5185578217 is a deficient number, since it is larger than the sum of its proper divisors (1).

5185578217 is an equidigital number, since it uses as much as digits as its factorization.

5185578217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 784000, while the sum is 49.

The square root of 5185578217 is about 72010.9590062513. The cubic root of 5185578217 is about 1730.8750979370.

The spelling of 5185578217 in words is "five billion, one hundred eighty-five million, five hundred seventy-eight thousand, two hundred seventeen".