51334681 has 4 divisors (see below), whose sum is σ = 51363172. Its totient is φ = 51306192.

The previous prime is 51334649. The next prime is 51334691. The reversal of 51334681 is 18643315.

51334681 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 can be written as a sum of positive squares in 2 ways, for example, as 29160000 + 22174681 = 5400^2 + 4709^2 .

It is a cyclic number.

It is not a de Polignac number, because 51334681 - 2⁵ = 51334649 is a prime.

It is a super-2 number, since 2×51334681² = 5270498946743522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51334601) 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, 11346 + ... + 15211.

It is an arithmetic number, because the mean of its divisors is an integer number (12840793).

Almost surely, 2^51334681 is an apocalyptic number.

It is an amenable number.

51334681 is a deficient number, since it is larger than the sum of its proper divisors (28491).

51334681 is a wasteful number, since it uses less digits than its factorization.

51334681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28490.

The product of its digits is 8640, while the sum is 31.

The square root of 51334681 is about 7164.8224681425. The cubic root of 51334681 is about 371.6524121524.

Adding to 51334681 its reverse (18643315), we get a palindrome (69977996).

The spelling of 51334681 in words is "fifty-one million, three hundred thirty-four thousand, six hundred eighty-one".