51549881 has 2 divisors, whose sum is σ = 51549882. Its totient is φ = 51549880.

The previous prime is 51549863. The next prime is 51549913. The reversal of 51549881 is 18894515.

51549881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49224256 + 2325625 = 7016^2 + 1525^2 .

It is a cyclic number.

It is not a de Polignac number, because 51549881 - 2¹⁴ = 51533497 is a prime.

It is a super-2 number, since 2×51549881² = 5314780462228322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (54549881) 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 as a sum of consecutive naturals, namely, 25774940 + 25774941.

It is an arithmetic number, because the mean of its divisors is an integer number (25774941).

Almost surely, 2^51549881 is an apocalyptic number.

It is an amenable number.

51549881 is a deficient number, since it is larger than the sum of its proper divisors (1).

51549881 is an equidigital number, since it uses as much as digits as its factorization.

51549881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 57600, while the sum is 41.

The square root of 51549881 is about 7179.8245800298. The cubic root of 51549881 is about 372.1710225494.

The spelling of 51549881 in words is "fifty-one million, five hundred forty-nine thousand, eight hundred eighty-one".