51999959 has 8 divisors (see below), whose sum is σ = 57068928. Its totient is φ = 46987960.

The previous prime is 51999919. The next prime is 51999971. The reversal of 51999959 is 95999915.

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 51999959 - 2¹² = 51995863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51999919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12317 + ... + 15990.

It is an arithmetic number, because the mean of its divisors is an integer number (7133616).

Almost surely, 2^51999959 is an apocalyptic number.

51999959 is a deficient number, since it is larger than the sum of its proper divisors (5068969).

51999959 is a wasteful number, since it uses less digits than its factorization.

51999959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28485.

The product of its digits is 1476225, while the sum is 56.

The square root of 51999959 is about 7211.0997080889. The cubic root of 51999959 is about 373.2510175836.

The spelling of 51999959 in words is "fifty-one million, nine hundred ninety-nine thousand, nine hundred fifty-nine".