51115843 has 4 divisors (see below), whose sum is σ = 51232720. Its totient is φ = 50998968.

The previous prime is 51115829. The next prime is 51115847. The reversal of 51115843 is 34851115.

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 51115843 - 2⁹ = 51115331 is a prime.

It is a super-2 number, since 2×51115843² = 5225658811201298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51115847) 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, 57780 + ... + 58657.

It is an arithmetic number, because the mean of its divisors is an integer number (12808180).

Almost surely, 2^51115843 is an apocalyptic number.

51115843 is a deficient number, since it is larger than the sum of its proper divisors (116877).

51115843 is a wasteful number, since it uses less digits than its factorization.

51115843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116876.

The product of its digits is 2400, while the sum is 28.

The square root of 51115843 is about 7149.5344603687. The cubic root of 51115843 is about 371.1235460599.

Adding to 51115843 its reverse (34851115), we get a palindrome (85966958).

The spelling of 51115843 in words is "fifty-one million, one hundred fifteen thousand, eight hundred forty-three".