51645223 has 16 divisors (see below), whose sum is σ = 60789760. Its totient is φ = 42962400.

The previous prime is 51645221. The next prime is 51645227. The reversal of 51645223 is 32254615.

It is a cyclic number.

It is not a de Polignac number, because 51645223 - 2¹ = 51645221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51645191 and 51645200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51645221) 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 15 ways as a sum of consecutive naturals, for example, 32968 + ... + 34498.

It is an arithmetic number, because the mean of its divisors is an integer number (3799360).

Almost surely, 2^51645223 is an apocalyptic number.

51645223 is a deficient number, since it is larger than the sum of its proper divisors (9144537).

51645223 is a wasteful number, since it uses less digits than its factorization.

51645223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1678.

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

The square root of 51645223 is about 7186.4610901333. The cubic root of 51645223 is about 372.4003258681.

Adding to 51645223 its reverse (32254615), we get a palindrome (83899838).

The spelling of 51645223 in words is "fifty-one million, six hundred forty-five thousand, two hundred twenty-three".