51791643 has 20 divisors (see below), whose sum is σ = 77591008. Its totient is φ = 34428240.

The previous prime is 51791627. The next prime is 51791647. The reversal of 51791643 is 34619715.

51791643 is a `hidden beast` number, since 5 + 1 + 7 + 9 + 1 + 643 = 666.

51791643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51791643 - 2⁴ = 51791627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51791598 and 51791607.

It is not an unprimeable number, because it can be changed into a prime (51791647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 36813 + ... + 38193.

Almost surely, 2^51791643 is an apocalyptic number.

51791643 is a deficient number, since it is larger than the sum of its proper divisors (25799365).

51791643 is a wasteful number, since it uses less digits than its factorization.

With its successor (51791644) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (1847).

51791643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1856 (or 1847 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 51791643 is about 7196.6410915093. The cubic root of 51791643 is about 372.7519260332.

The spelling of 51791643 in words is "fifty-one million, seven hundred ninety-one thousand, six hundred forty-three".