51461281 has 4 divisors (see below), whose sum is σ = 53698752. Its totient is φ = 49223812.

The previous prime is 51461233. The next prime is 51461309. The reversal of 51461281 is 18216415.

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 51461281 - 2⁹ = 51460769 is a prime.

It is a super-2 number, since 2×51461281² = 5296526884321922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51461231) 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, 1118701 + ... + 1118746.

It is an arithmetic number, because the mean of its divisors is an integer number (13424688).

Almost surely, 2^51461281 is an apocalyptic number.

It is an amenable number.

51461281 is a deficient number, since it is larger than the sum of its proper divisors (2237471).

51461281 is a wasteful number, since it uses less digits than its factorization.

51461281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2237470.

The product of its digits is 1920, while the sum is 28.

The square root of 51461281 is about 7173.6518594088. The cubic root of 51461281 is about 371.9576805637.

Adding to 51461281 its reverse (18216415), we get a palindrome (69677696).

The spelling of 51461281 in words is "fifty-one million, four hundred sixty-one thousand, two hundred eighty-one".