51845121 has 12 divisors (see below), whose sum is σ = 79292772. Its totient is φ = 32530176.

The previous prime is 51845119. The next prime is 51845141. The reversal of 51845121 is 12154815.

It can be written as a sum of positive squares in 2 ways, for example, as 47114496 + 4730625 = 6864^2 + 2175^2 .

It is not a de Polignac number, because 51845121 - 2¹ = 51845119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51845141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 169276 + ... + 169581.

It is an arithmetic number, because the mean of its divisors is an integer number (6607731).

Almost surely, 2^51845121 is an apocalyptic number.

51845121 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

51845121 is a deficient number, since it is larger than the sum of its proper divisors (27447651).

51845121 is a wasteful number, since it uses less digits than its factorization.

51845121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338880 (or 338877 counting only the distinct ones).

The product of its digits is 1600, while the sum is 27.

The square root of 51845121 is about 7200.3556162179. The cubic root of 51845121 is about 372.8801781942.

Adding to 51845121 its reverse (12154815), we get a palindrome (63999936).

The spelling of 51845121 in words is "fifty-one million, eight hundred forty-five thousand, one hundred twenty-one".