51665233 has 4 divisors (see below), whose sum is σ = 51679728. Its totient is φ = 51650740.

The previous prime is 51665219. The next prime is 51665279. The reversal of 51665233 is 33256615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 51665233 - 2¹³ = 51657041 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51665195 and 51665204.

It is not an unprimeable number, because it can be changed into a prime (51665203) 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, 2238 + ... + 10408.

It is an arithmetic number, because the mean of its divisors is an integer number (12919932).

Almost surely, 2^51665233 is an apocalyptic number.

It is an amenable number.

51665233 is a deficient number, since it is larger than the sum of its proper divisors (14495).

51665233 is an equidigital number, since it uses as much as digits as its factorization.

51665233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14494.

The product of its digits is 16200, while the sum is 31.

The square root of 51665233 is about 7187.8531565412. The cubic root of 51665233 is about 372.4484153002.

The spelling of 51665233 in words is "fifty-one million, six hundred sixty-five thousand, two hundred thirty-three".