5171181820 has 96 divisors (see below), whose sum is σ = 12596330880. Its totient is φ = 1746662400.

The previous prime is 5171181773. The next prime is 5171181871. The reversal of 5171181820 is 281811715.

It is a super-2 number, since 2×5171181820² = 53482242830997024800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3237262 + ... + 3238858.

It is an arithmetic number, because the mean of its divisors is an integer number (131211780).

Almost surely, 2^5171181820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5171181820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6298165440).

5171181820 is an abundant number, since it is smaller than the sum of its proper divisors (7425149060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

5171181820 is a wasteful number, since it uses less digits than its factorization.

5171181820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1943 (or 1941 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 34.

The square root of 5171181820 is about 71910.9297673170. The cubic root of 5171181820 is about 1729.2718398609.

The spelling of 5171181820 in words is "five billion, one hundred seventy-one million, one hundred eighty-one thousand, eight hundred twenty".