51816199 has 4 divisors (see below), whose sum is σ = 52087680. Its totient is φ = 51544720.

The previous prime is 51816197. The next prime is 51816229. The reversal of 51816199 is 99161815.

51816199 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51816199 - 2¹ = 51816197 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51816197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135454 + ... + 135835.

It is an arithmetic number, because the mean of its divisors is an integer number (13021920).

Almost surely, 2^51816199 is an apocalyptic number.

51816199 is a deficient number, since it is larger than the sum of its proper divisors (271481).

51816199 is a wasteful number, since it uses less digits than its factorization.

51816199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271480.

The product of its digits is 19440, while the sum is 40.

The square root of 51816199 is about 7198.3469630187. The cubic root of 51816199 is about 372.8108277500.

The spelling of 51816199 in words is "fifty-one million, eight hundred sixteen thousand, one hundred ninety-nine".