51803993 has 4 divisors (see below), whose sum is σ = 51831168. Its totient is φ = 51776820.

The previous prime is 51803933. The next prime is 51804001. The reversal of 51803993 is 39930815.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39930815 = 5 ⋅7986163.

It is a cyclic number.

It is not a de Polignac number, because 51803993 - 2⁶ = 51803929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51803923) 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, 10493 + ... + 14618.

It is an arithmetic number, because the mean of its divisors is an integer number (12957792).

Almost surely, 2^51803993 is an apocalyptic number.

It is an amenable number.

51803993 is a deficient number, since it is larger than the sum of its proper divisors (27175).

51803993 is a wasteful number, since it uses less digits than its factorization.

51803993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27174.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 51803993 is about 7197.4990795414. The cubic root of 51803993 is about 372.7815519224.

The spelling of 51803993 in words is "fifty-one million, eight hundred three thousand, nine hundred ninety-three".