51423223 has 4 divisors (see below), whose sum is σ = 51492448. Its totient is φ = 51354000.

The previous prime is 51423209. The next prime is 51423247. The reversal of 51423223 is 32232415.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32232415 = 5 ⋅6446483.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51423223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51423194 and 51423203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51423263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33486 + ... + 34987.

It is an arithmetic number, because the mean of its divisors is an integer number (12873112).

Almost surely, 2^51423223 is an apocalyptic number.

51423223 is a deficient number, since it is larger than the sum of its proper divisors (69225).

51423223 is an equidigital number, since it uses as much as digits as its factorization.

51423223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69224.

The product of its digits is 1440, while the sum is 22.

The square root of 51423223 is about 7170.9987449448. The cubic root of 51423223 is about 371.8659646417.

Adding to 51423223 its reverse (32232415), we get a palindrome (83655638).

The spelling of 51423223 in words is "fifty-one million, four hundred twenty-three thousand, two hundred twenty-three".