51801199 has 4 divisors (see below), whose sum is σ = 52196760. Its totient is φ = 51405640.

The previous prime is 51801181. The next prime is 51801241. The reversal of 51801199 is 99110815.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99110815 = 5 ⋅19822163.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51801199 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 (51801119) 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, 197584 + ... + 197845.

It is an arithmetic number, because the mean of its divisors is an integer number (13049190).

Almost surely, 2^51801199 is an apocalyptic number.

51801199 is a deficient number, since it is larger than the sum of its proper divisors (395561).

51801199 is a wasteful number, since it uses less digits than its factorization.

51801199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395560.

The product of its (nonzero) digits is 3240, while the sum is 34.

The square root of 51801199 is about 7197.3049817275. The cubic root of 51801199 is about 372.7748499269.

The spelling of 51801199 in words is "fifty-one million, eight hundred one thousand, one hundred ninety-nine".