51749887 has 8 divisors (see below), whose sum is σ = 62621856. Its totient is φ = 41747712.

The previous prime is 51749857. The next prime is 51749909. The reversal of 51749887 is 78894715.

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 51749887 - 2¹⁵ = 51717119 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 51749887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51749807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217318 + ... + 217555.

It is an arithmetic number, because the mean of its divisors is an integer number (7827732).

Almost surely, 2^51749887 is an apocalyptic number.

51749887 is a deficient number, since it is larger than the sum of its proper divisors (10871969).

51749887 is a wasteful number, since it uses less digits than its factorization.

51749887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434897.

The product of its digits is 564480, while the sum is 49.

The square root of 51749887 is about 7193.7394309219. The cubic root of 51749887 is about 372.6517244480.

The spelling of 51749887 in words is "fifty-one million, seven hundred forty-nine thousand, eight hundred eighty-seven".