51331843 has 4 divisors (see below), whose sum is σ = 51375240. Its totient is φ = 51288448.

The previous prime is 51331807. The next prime is 51331853. The reversal of 51331843 is 34813315.

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 51331843 - 2²⁵ = 17777411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51331853) 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, 19873 + ... + 22306.

It is an arithmetic number, because the mean of its divisors is an integer number (12843810).

Almost surely, 2^51331843 is an apocalyptic number.

51331843 is a deficient number, since it is larger than the sum of its proper divisors (43397).

51331843 is a wasteful number, since it uses less digits than its factorization.

51331843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43396.

The product of its digits is 4320, while the sum is 28.

The square root of 51331843 is about 7164.6244144407. The cubic root of 51331843 is about 371.6455631829.

The spelling of 51331843 in words is "fifty-one million, three hundred thirty-one thousand, eight hundred forty-three".