51327121 has 4 divisors (see below), whose sum is σ = 52579044. Its totient is φ = 50075200.

The previous prime is 51327091. The next prime is 51327127. The reversal of 51327121 is 12172315.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2676496 + 48650625 = 1636^2 + 6975^2 .

It is a cyclic number.

It is not a de Polignac number, because 51327121 - 2⁹ = 51326609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51327092 and 51327101.

It is not an unprimeable number, because it can be changed into a prime (51327127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 625900 + ... + 625981.

It is an arithmetic number, because the mean of its divisors is an integer number (13144761).

Almost surely, 2^51327121 is an apocalyptic number.

It is an amenable number.

51327121 is a deficient number, since it is larger than the sum of its proper divisors (1251923).

51327121 is a wasteful number, since it uses less digits than its factorization.

51327121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1251922.

The product of its digits is 420, while the sum is 22.

The square root of 51327121 is about 7164.2948710951. The cubic root of 51327121 is about 371.6341669809.

Adding to 51327121 its reverse (12172315), we get a palindrome (63499436).

The spelling of 51327121 in words is "fifty-one million, three hundred twenty-seven thousand, one hundred twenty-one".