51489587 has 4 divisors (see below), whose sum is σ = 53265120. Its totient is φ = 49714056.

The previous prime is 51489539. The next prime is 51489623. The reversal of 51489587 is 78598415.

51489587 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51489587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51489517) 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 3 ways as a sum of consecutive naturals, for example, 887723 + ... + 887780.

It is an arithmetic number, because the mean of its divisors is an integer number (13316280).

Almost surely, 2^51489587 is an apocalyptic number.

51489587 is a deficient number, since it is larger than the sum of its proper divisors (1775533).

51489587 is a wasteful number, since it uses less digits than its factorization.

51489587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775532.

The product of its digits is 403200, while the sum is 47.

The square root of 51489587 is about 7175.6245024388. The cubic root of 51489587 is about 372.0258658355.

The spelling of 51489587 in words is "fifty-one million, four hundred eighty-nine thousand, five hundred eighty-seven".