51643123 has 4 divisors (see below), whose sum is σ = 59020720. Its totient is φ = 44265528.

The previous prime is 51643103. The next prime is 51643183. The reversal of 51643123 is 32134615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32134615 = 5 ⋅6426923.

It is a cyclic number.

It is not a de Polignac number, because 51643123 - 2²¹ = 49545971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51643103) 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, 3688788 + ... + 3688801.

It is an arithmetic number, because the mean of its divisors is an integer number (14755180).

Almost surely, 2^51643123 is an apocalyptic number.

51643123 is a deficient number, since it is larger than the sum of its proper divisors (7377597).

51643123 is an equidigital number, since it uses as much as digits as its factorization.

51643123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7377596.

The product of its digits is 2160, while the sum is 25.

The square root of 51643123 is about 7186.3149805724. The cubic root of 51643123 is about 372.3952782810.

Adding to 51643123 its reverse (32134615), we get a palindrome (83777738).

The spelling of 51643123 in words is "fifty-one million, six hundred forty-three thousand, one hundred twenty-three".