51289727 has 4 divisors (see below), whose sum is σ = 51992400. Its totient is φ = 50587056.

The previous prime is 51289699. The next prime is 51289741. The reversal of 51289727 is 72798215.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51289727 - 2¹² = 51285631 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 (51289757) 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 3 ways as a sum of consecutive naturals, for example, 351227 + ... + 351372.

It is an arithmetic number, because the mean of its divisors is an integer number (12998100).

Almost surely, 2^51289727 is an apocalyptic number.

51289727 is a deficient number, since it is larger than the sum of its proper divisors (702673).

51289727 is an equidigital number, since it uses as much as digits as its factorization.

51289727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702672.

The product of its digits is 70560, while the sum is 41.

The square root of 51289727 is about 7161.6846481816. The cubic root of 51289727 is about 371.5438946001.

The spelling of 51289727 in words is "fifty-one million, two hundred eighty-nine thousand, seven hundred twenty-seven".