51645043 has 4 divisors (see below), whose sum is σ = 51702160. Its totient is φ = 51587928.

The previous prime is 51645029. The next prime is 51645049. The reversal of 51645043 is 34054615.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51645043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51645049) 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, 27180 + ... + 29017.

It is an arithmetic number, because the mean of its divisors is an integer number (12925540).

Almost surely, 2^51645043 is an apocalyptic number.

51645043 is a deficient number, since it is larger than the sum of its proper divisors (57117).

51645043 is an equidigital number, since it uses as much as digits as its factorization.

51645043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57116.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 51645043 is about 7186.4485665731. The cubic root of 51645043 is about 372.3998932231.

Adding to 51645043 its reverse (34054615), we get a palindrome (85699658).

The spelling of 51645043 in words is "fifty-one million, six hundred forty-five thousand, forty-three".