51681651 has 8 divisors (see below), whose sum is σ = 78753024. Its totient is φ = 29532360.

The previous prime is 51681613. The next prime is 51681661. The reversal of 51681651 is 15618615.

51681651 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 not a de Polignac number, because 51681651 - 2⁷ = 51681523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51681601) 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, 1230495 + ... + 1230536.

It is an arithmetic number, because the mean of its divisors is an integer number (9844128).

Almost surely, 2^51681651 is an apocalyptic number.

51681651 is a deficient number, since it is larger than the sum of its proper divisors (27071373).

51681651 is a wasteful number, since it uses less digits than its factorization.

51681651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2461041.

The product of its digits is 7200, while the sum is 33.

The square root of 51681651 is about 7188.9951314492. The cubic root of 51681651 is about 372.4878629140.

The spelling of 51681651 in words is "fifty-one million, six hundred eighty-one thousand, six hundred fifty-one".