51559281 has 8 divisors (see below), whose sum is σ = 76384160. Its totient is φ = 34372836.

The previous prime is 51559273. The next prime is 51559349. The reversal of 51559281 is 18295515.

It is a happy number.

It is not a de Polignac number, because 51559281 - 2³ = 51559273 is a prime.

It is a super-2 number, since 2×51559281² = 5316718914473922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51559201) 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, 954775 + ... + 954828.

It is an arithmetic number, because the mean of its divisors is an integer number (9548020).

Almost surely, 2^51559281 is an apocalyptic number.

It is an amenable number.

51559281 is a deficient number, since it is larger than the sum of its proper divisors (24824879).

51559281 is a wasteful number, since it uses less digits than its factorization.

51559281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1909612 (or 1909606 counting only the distinct ones).

The product of its digits is 18000, while the sum is 36.

The square root of 51559281 is about 7180.4791622844. The cubic root of 51559281 is about 372.1936426792.

The spelling of 51559281 in words is "fifty-one million, five hundred fifty-nine thousand, two hundred eighty-one".