51388281 has 12 divisors (see below), whose sum is σ = 84831552. Its totient is φ = 29364696.

The previous prime is 51388273. The next prime is 51388283. The reversal of 51388281 is 18288315.

51388281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51388281 - 2³ = 51388273 is a prime.

It is a super-2 number, since 2×51388281² = 5281510848269922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51388283) 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 11 ways as a sum of consecutive naturals, for example, 407781 + ... + 407906.

It is an arithmetic number, because the mean of its divisors is an integer number (7069296).

Almost surely, 2^51388281 is an apocalyptic number.

It is an amenable number.

51388281 is a deficient number, since it is larger than the sum of its proper divisors (33443271).

51388281 is a wasteful number, since it uses less digits than its factorization.

51388281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815700 (or 815697 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 51388281 is about 7168.5619896880. The cubic root of 51388281 is about 371.7817181089.

The spelling of 51388281 in words is "fifty-one million, three hundred eighty-eight thousand, two hundred eighty-one".