51481845 has 16 divisors (see below), whose sum is σ = 91523520. Its totient is φ = 27456912.

The previous prime is 51481823. The next prime is 51481853. The reversal of 51481845 is 54818415.

51481845 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 51481845 - 2¹⁴ = 51465461 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 190539 + ... + 190808.

It is an arithmetic number, because the mean of its divisors is an integer number (5720220).

Almost surely, 2^51481845 is an apocalyptic number.

It is an amenable number.

51481845 is a deficient number, since it is larger than the sum of its proper divisors (40041675).

51481845 is a wasteful number, since it uses less digits than its factorization.

51481845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381361 (or 381355 counting only the distinct ones).

The product of its digits is 25600, while the sum is 36.

The square root of 51481845 is about 7175.0850169179. The cubic root of 51481845 is about 372.0072189026.

It can be divided in two parts, 51481 and 845, that added together give a triangular number (52326 = T₃₂₃).

The spelling of 51481845 in words is "fifty-one million, four hundred eighty-one thousand, eight hundred forty-five".