51327381 has 8 divisors (see below), whose sum is σ = 78213184. Its totient is φ = 29329920.

The previous prime is 51327377. The next prime is 51327389. The reversal of 51327381 is 18372315.

51327381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 51327381 - 2² = 51327377 is a prime.

It is a super-2 number, since 2×51327381² = 5269000080638322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51327389) 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 7 ways as a sum of consecutive naturals, for example, 1222060 + ... + 1222101.

It is an arithmetic number, because the mean of its divisors is an integer number (9776648).

Almost surely, 2^51327381 is an apocalyptic number.

It is an amenable number.

51327381 is a deficient number, since it is larger than the sum of its proper divisors (26885803).

51327381 is a wasteful number, since it uses less digits than its factorization.

51327381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2444171.

The product of its digits is 5040, while the sum is 30.

The square root of 51327381 is about 7164.3130166123. The cubic root of 51327381 is about 371.6347944901.

Adding to 51327381 its reverse (18372315), we get a palindrome (69699696).

The spelling of 51327381 in words is "fifty-one million, three hundred twenty-seven thousand, three hundred eighty-one".