51689257 has 8 divisors (see below), whose sum is σ = 54955584. Its totient is φ = 48507888.

The previous prime is 51689249. The next prime is 51689269. The reversal of 51689257 is 75298615.

51689257 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 51689257 - 2³ = 51689249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51689657) 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, 19983 + ... + 22420.

It is an arithmetic number, because the mean of its divisors is an integer number (6869448).

Almost surely, 2^51689257 is an apocalyptic number.

It is an amenable number.

51689257 is a deficient number, since it is larger than the sum of its proper divisors (3266327).

51689257 is a wasteful number, since it uses less digits than its factorization.

51689257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42479.

The product of its digits is 151200, while the sum is 43.

The square root of 51689257 is about 7189.5241149884. The cubic root of 51689257 is about 372.5061350580.

The spelling of 51689257 in words is "fifty-one million, six hundred eighty-nine thousand, two hundred fifty-seven".