51809373 has 24 divisors (see below), whose sum is σ = 93302976. Its totient is φ = 26913600.

The previous prime is 51809357. The next prime is 51809377. The reversal of 51809373 is 37390815.

51809373 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 51809373 - 2⁴ = 51809357 is a prime.

It is a super-2 number, since 2×51809373² = 5368422261306258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51809377) 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 23 ways as a sum of consecutive naturals, for example, 36688 + ... + 38073.

It is an arithmetic number, because the mean of its divisors is an integer number (3887624).

Almost surely, 2^51809373 is an apocalyptic number.

It is an amenable number.

51809373 is a deficient number, since it is larger than the sum of its proper divisors (41493603).

51809373 is a wasteful number, since it uses less digits than its factorization.

51809373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74785 (or 74782 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 51809373 is about 7197.8728107685. The cubic root of 51809373 is about 372.7944563030.

The spelling of 51809373 in words is "fifty-one million, eight hundred nine thousand, three hundred seventy-three".