51006281 has 4 divisors (see below), whose sum is σ = 51036672. Its totient is φ = 50975892.

The previous prime is 51006217. The next prime is 51006289. The reversal of 51006281 is 18260015.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51006281 - 2⁶ = 51006217 is a prime.

It is a super-2 number, since 2×51006281² = 5203281402901922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51006289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12521 + ... + 16086.

It is an arithmetic number, because the mean of its divisors is an integer number (12759168).

Almost surely, 2^51006281 is an apocalyptic number.

It is an amenable number.

51006281 is a deficient number, since it is larger than the sum of its proper divisors (30391).

51006281 is a wasteful number, since it uses less digits than its factorization.

51006281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30390.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 51006281 is about 7141.8681729643. The cubic root of 51006281 is about 370.8582002542.

Adding to 51006281 its reverse (18260015), we get a palindrome (69266296).

The spelling of 51006281 in words is "fifty-one million, six thousand, two hundred eighty-one".