51998287 has 8 divisors (see below), whose sum is σ = 56811600. Its totient is φ = 47199360.

The previous prime is 51998279. The next prime is 51998299. The reversal of 51998287 is 78289915.

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 51998287 - 2³ = 51998279 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51998287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51998227) 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, 4839 + ... + 11287.

It is an arithmetic number, because the mean of its divisors is an integer number (7101450).

Almost surely, 2^51998287 is an apocalyptic number.

51998287 is a deficient number, since it is larger than the sum of its proper divisors (4813313).

51998287 is a wasteful number, since it uses less digits than its factorization.

51998287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7193.

The product of its digits is 362880, while the sum is 49.

The square root of 51998287 is about 7210.9837747703. The cubic root of 51998287 is about 373.2470170524.

The spelling of 51998287 in words is "fifty-one million, nine hundred ninety-eight thousand, two hundred eighty-seven".