51000459281 has 32 divisors (see below), whose sum is σ = 55566000000. Its totient is φ = 46649917440.

The previous prime is 51000459269. The next prime is 51000459287. The reversal of 51000459281 is 18295400015.

It is a cyclic number.

It is not a de Polignac number, because 51000459281 - 2¹⁸ = 51000197137 is a prime.

It is a super-2 number, since 2×51000459281² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51000459287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48617645 + ... + 48618693.

It is an arithmetic number, because the mean of its divisors is an integer number (1736437500).

Almost surely, 2^51000459281 is an apocalyptic number.

It is an amenable number.

51000459281 is a deficient number, since it is larger than the sum of its proper divisors (4565540719).

51000459281 is a wasteful number, since it uses less digits than its factorization.

51000459281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1697.

The product of its (nonzero) digits is 14400, while the sum is 35.

Adding to 51000459281 its reverse (18295400015), we get a palindrome (69295859296).

The spelling of 51000459281 in words is "fifty-one billion, four hundred fifty-nine thousand, two hundred eighty-one".