51033645 has 64 divisors (see below), whose sum is σ = 99187200. Its totient is φ = 25054272.

The previous prime is 51033641. The next prime is 51033679. The reversal of 51033645 is 54633015.

51033645 is a `hidden beast` number, since 5 + 10 + 3 + 3 + 645 = 666.

51033645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51033645 - 2² = 51033641 is a prime.

It is a super-3 number, since 3×51033645³ (a number of 24 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51033641) 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 63 ways as a sum of consecutive naturals, for example, 141976 + ... + 142334.

It is an arithmetic number, because the mean of its divisors is an integer number (1549800).

Almost surely, 2^51033645 is an apocalyptic number.

It is an amenable number.

51033645 is a deficient number, since it is larger than the sum of its proper divisors (48153555).

51033645 is an equidigital number, since it uses as much as digits as its factorization.

51033645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398 (or 380 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 51033645 is about 7143.7836613380. The cubic root of 51033645 is about 370.9245080982.

The spelling of 51033645 in words is "fifty-one million, thirty-three thousand, six hundred forty-five".