51240033 has 20 divisors (see below), whose sum is σ = 82433428. Its totient is φ = 31531680.

The previous prime is 51240019. The next prime is 51240073. The reversal of 51240033 is 33004215.

51240033 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 11209104 + 40030929 = 3348^2 + 6327^2 .

It is not a de Polignac number, because 51240033 - 2⁵ = 51240001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51239988 and 51240015.

It is not an unprimeable number, because it can be changed into a prime (51240073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 23278 + ... + 25383.

Almost surely, 2^51240033 is an apocalyptic number.

It is an amenable number.

51240033 is a deficient number, since it is larger than the sum of its proper divisors (31193395).

51240033 is a wasteful number, since it uses less digits than its factorization.

51240033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48686 (or 48677 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 51240033 is about 7158.2143723138. The cubic root of 51240033 is about 371.4238610208.

Adding to 51240033 its reverse (33004215), we get a palindrome (84244248).

The spelling of 51240033 in words is "fifty-one million, two hundred forty thousand, thirty-three".