5185217161 has 4 divisors (see below), whose sum is σ = 5185887300. Its totient is φ = 5184547024.

The previous prime is 5185217153. The next prime is 5185217171. The reversal of 5185217161 is 1617125815.

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 949810761 + 4235406400 = 30819^2 + 65080^2 .

It is a cyclic number.

It is not a de Polignac number, because 5185217161 - 2³ = 5185217153 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5185217161.

It is not an unprimeable number, because it can be changed into a prime (5185217131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 323326 + ... + 338983.

It is an arithmetic number, because the mean of its divisors is an integer number (1296471825).

Almost surely, 2^5185217161 is an apocalyptic number.

It is an amenable number.

5185217161 is a deficient number, since it is larger than the sum of its proper divisors (670139).

5185217161 is an equidigital number, since it uses as much as digits as its factorization.

5185217161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670138.

The product of its digits is 16800, while the sum is 37.

The square root of 5185217161 is about 72008.4520108577. The cubic root of 5185217161 is about 1730.8349251527.

The spelling of 5185217161 in words is "five billion, one hundred eighty-five million, two hundred seventeen thousand, one hundred sixty-one".