51868199 has 4 divisors (see below), whose sum is σ = 51883320. Its totient is φ = 51853080.

The previous prime is 51868183. The next prime is 51868237. The reversal of 51868199 is 99186815.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 51868199 - 2⁴ = 51868183 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 (51868109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332 + ... + 10190.

It is an arithmetic number, because the mean of its divisors is an integer number (12970830).

Almost surely, 2^51868199 is an apocalyptic number.

51868199 is a deficient number, since it is larger than the sum of its proper divisors (15121).

51868199 is an equidigital number, since it uses as much as digits as its factorization.

51868199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15120.

The product of its digits is 155520, while the sum is 47.

The square root of 51868199 is about 7201.9579976559. The cubic root of 51868199 is about 372.9354971394.

The spelling of 51868199 in words is "fifty-one million, eight hundred sixty-eight thousand, one hundred ninety-nine".