5185051821 has 6 divisors (see below), whose sum is σ = 7489519310. Its totient is φ = 3456701208.

The previous prime is 5185051813. The next prime is 5185051831. The reversal of 5185051821 is 1281505815.

It can be written as a sum of positive squares in only one way, i.e., 4184278596 + 1000773225 = 64686^2 + 31635^2 .

It is not a de Polignac number, because 5185051821 - 2³ = 5185051813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5185051831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 288058426 + ... + 288058443.

Almost surely, 2^5185051821 is an apocalyptic number.

It is an amenable number.

5185051821 is a deficient number, since it is larger than the sum of its proper divisors (2304467489).

5185051821 is a wasteful number, since it uses less digits than its factorization.

5185051821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576116875 (or 576116872 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 36.

The square root of 5185051821 is about 72007.3039420308. The cubic root of 5185051821 is about 1730.8165280262.

The spelling of 5185051821 in words is "five billion, one hundred eighty-five million, fifty-one thousand, eight hundred twenty-one".