51851943 has 24 divisors (see below), whose sum is σ = 87993360. Its totient is φ = 29007360.

The previous prime is 51851929. The next prime is 51851953. The reversal of 51851943 is 34915815.

51851943 is a `hidden beast` number, since 518 + 51 + 94 + 3 = 666.

It is not a de Polignac number, because 51851943 - 2⁴ = 51851927 is a prime.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 51851898 and 51851907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51851953) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18858 + ... + 21431.

It is an arithmetic number, because the mean of its divisors is an integer number (3666390).

Almost surely, 2^51851943 is an apocalyptic number.

51851943 is a deficient number, since it is larger than the sum of its proper divisors (36141417).

51851943 is a wasteful number, since it uses less digits than its factorization.

51851943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40319 (or 40316 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 51851943 is about 7200.8293272372. The cubic root of 51851943 is about 372.8965325265.

The spelling of 51851943 in words is "fifty-one million, eight hundred fifty-one thousand, nine hundred forty-three".