51686441 has 8 divisors (see below), whose sum is σ = 54756480. Its totient is φ = 48651408.

The previous prime is 51686431. The next prime is 51686471. The reversal of 51686441 is 14468615.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51686441 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51686431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5681 + ... + 11646.

It is an arithmetic number, because the mean of its divisors is an integer number (6844560).

Almost surely, 2^51686441 is an apocalyptic number.

It is an amenable number.

51686441 is a deficient number, since it is larger than the sum of its proper divisors (3070039).

51686441 is a wasteful number, since it uses less digits than its factorization.

51686441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17503.

The product of its digits is 23040, while the sum is 35.

The square root of 51686441 is about 7189.3282718207. The cubic root of 51686441 is about 372.4993702976.

The spelling of 51686441 in words is "fifty-one million, six hundred eighty-six thousand, four hundred forty-one".