51281329 has 8 divisors (see below), whose sum is σ = 58375872. Its totient is φ = 44592240.

The previous prime is 51281317. The next prime is 51281357. The reversal of 51281329 is 92318215.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51281329 - 2¹⁹ = 50757041 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51281329.

It is not an unprimeable number, because it can be changed into a prime (51281359) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101094 + ... + 101599.

It is an arithmetic number, because the mean of its divisors is an integer number (7296984).

Almost surely, 2^51281329 is an apocalyptic number.

It is an amenable number.

51281329 is a deficient number, since it is larger than the sum of its proper divisors (7094543).

51281329 is a wasteful number, since it uses less digits than its factorization.

51281329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202727.

The product of its digits is 4320, while the sum is 31.

The square root of 51281329 is about 7161.0983096170. The cubic root of 51281329 is about 371.5236150619.

The spelling of 51281329 in words is "fifty-one million, two hundred eighty-one thousand, three hundred twenty-nine".