51649959 has 8 divisors (see below), whose sum is σ = 69369840. Its totient is φ = 34181696.

The previous prime is 51649951. The next prime is 51650033. The reversal of 51649959 is 95994615.

51649959 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 51649959 - 2³ = 51649951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51649951) 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, 62424 + ... + 63245.

It is an arithmetic number, because the mean of its divisors is an integer number (8671230).

Almost surely, 2^51649959 is an apocalyptic number.

51649959 is a deficient number, since it is larger than the sum of its proper divisors (17719881).

51649959 is a wasteful number, since it uses less digits than its factorization.

51649959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125809.

The product of its digits is 437400, while the sum is 48.

The square root of 51649959 is about 7186.7905910775. The cubic root of 51649959 is about 372.4117088766.

The spelling of 51649959 in words is "fifty-one million, six hundred forty-nine thousand, nine hundred fifty-nine".