51121843 has 4 divisors (see below), whose sum is σ = 51959968. Its totient is φ = 50283720.

The previous prime is 51121841. The next prime is 51121849. The reversal of 51121843 is 34812115.

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

It is a cyclic number.

It is not a de Polignac number, because 51121843 - 2¹ = 51121841 is a prime.

It is a super-2 number, since 2×51121843² = 5226885663433298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51121841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 418971 + ... + 419092.

It is an arithmetic number, because the mean of its divisors is an integer number (12989992).

Almost surely, 2^51121843 is an apocalyptic number.

51121843 is a deficient number, since it is larger than the sum of its proper divisors (838125).

51121843 is an equidigital number, since it uses as much as digits as its factorization.

51121843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838124.

The product of its digits is 960, while the sum is 25.

The square root of 51121843 is about 7149.9540557964. The cubic root of 51121843 is about 371.1380663732.

Adding to 51121843 its reverse (34812115), we get a palindrome (85933958).

The spelling of 51121843 in words is "fifty-one million, one hundred twenty-one thousand, eight hundred forty-three".