51287251 has 8 divisors (see below), whose sum is σ = 54087680. Its totient is φ = 48496968.

The previous prime is 51287233. The next prime is 51287279. The reversal of 51287251 is 15278215.

51287251 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 not a de Polignac number, because 51287251 - 2⁵ = 51287219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51287281) 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, 9310 + ... + 13756.

It is an arithmetic number, because the mean of its divisors is an integer number (6760960).

Almost surely, 2^51287251 is an apocalyptic number.

51287251 is a deficient number, since it is larger than the sum of its proper divisors (2800429).

51287251 is a wasteful number, since it uses less digits than its factorization.

51287251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5073.

The product of its digits is 5600, while the sum is 31.

The square root of 51287251 is about 7161.5117817399. The cubic root of 51287251 is about 371.5379157713.

The spelling of 51287251 in words is "fifty-one million, two hundred eighty-seven thousand, two hundred fifty-one".