51721803 has 36 divisors (see below), whose sum is σ = 92032200. Its totient is φ = 27812736.

The previous prime is 51721801. The next prime is 51721807. The reversal of 51721803 is 30812715.

51721803 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51721803 - 2¹ = 51721801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51721801) 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 35 ways as a sum of consecutive naturals, for example, 4048 + ... + 10946.

It is an arithmetic number, because the mean of its divisors is an integer number (2556450).

Almost surely, 2^51721803 is an apocalyptic number.

51721803 is a deficient number, since it is larger than the sum of its proper divisors (40310397).

51721803 is a wasteful number, since it uses less digits than its factorization.

51721803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6936 (or 6926 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 51721803 is about 7191.7871909561. The cubic root of 51721803 is about 372.5843011460.

The spelling of 51721803 in words is "fifty-one million, seven hundred twenty-one thousand, eight hundred three".