51281375 has 16 divisors (see below), whose sum is σ = 66785472. Its totient is φ = 39239200.

The previous prime is 51281359. The next prime is 51281387. The reversal of 51281375 is 57318215.

It is not a de Polignac number, because 51281375 - 2⁴ = 51281359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6044 + ... + 11793.

It is an arithmetic number, because the mean of its divisors is an integer number (4174092).

Almost surely, 2^51281375 is an apocalyptic number.

51281375 is a deficient number, since it is larger than the sum of its proper divisors (15504097).

51281375 is a wasteful number, since it uses less digits than its factorization.

51281375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17875 (or 17865 counting only the distinct ones).

The product of its digits is 8400, while the sum is 32.

The square root of 51281375 is about 7161.1015214141. The cubic root of 51281375 is about 371.5237261489.

The spelling of 51281375 in words is "fifty-one million, two hundred eighty-one thousand, three hundred seventy-five".