51873681 has 8 divisors (see below), whose sum is σ = 73233504. Its totient is φ = 32548160.

The previous prime is 51873649. The next prime is 51873683. The reversal of 51873681 is 18637815.

51873681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51873681 - 2⁵ = 51873649 is a prime.

It is a super-2 number, since 2×51873681² = 5381757560979522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51873683) 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 7 ways as a sum of consecutive naturals, for example, 508515 + ... + 508616.

It is an arithmetic number, because the mean of its divisors is an integer number (9154188).

Almost surely, 2^51873681 is an apocalyptic number.

51873681 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

51873681 is a deficient number, since it is larger than the sum of its proper divisors (21359823).

51873681 is a wasteful number, since it uses less digits than its factorization.

51873681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017151.

The product of its digits is 40320, while the sum is 39.

The square root of 51873681 is about 7202.3385785452. The cubic root of 51873681 is about 372.9486353141.

The spelling of 51873681 in words is "fifty-one million, eight hundred seventy-three thousand, six hundred eighty-one".