51756943 has 4 divisors (see below), whose sum is σ = 59150800. Its totient is φ = 44363088.

The previous prime is 51756889. The next prime is 51756979. The reversal of 51756943 is 34965715.

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

It is not a de Polignac number, because 51756943 - 2²⁵ = 18202511 is a prime.

It is a super-2 number, since 2×51756943² = 5357562297410498, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51756896 and 51756905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51756043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3696918 + ... + 3696931.

It is an arithmetic number, because the mean of its divisors is an integer number (14787700).

Almost surely, 2^51756943 is an apocalyptic number.

51756943 is a deficient number, since it is larger than the sum of its proper divisors (7393857).

51756943 is an equidigital number, since it uses as much as digits as its factorization.

51756943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7393856.

The product of its digits is 113400, while the sum is 40.

The square root of 51756943 is about 7194.2298406431. The cubic root of 51756943 is about 372.6686604661.

The spelling of 51756943 in words is "fifty-one million, seven hundred fifty-six thousand, nine hundred forty-three".