51505047 has 24 divisors (see below), whose sum is σ = 81963648. Its totient is φ = 30906000.

The previous prime is 51505039. The next prime is 51505049. The reversal of 51505047 is 74050515.

51505047 is a `hidden beast` number, since 5 + 150 + 504 + 7 = 666.

It is not a de Polignac number, because 51505047 - 2³ = 51505039 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51505047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51505049) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7672 + ... + 12722.

It is an arithmetic number, because the mean of its divisors is an integer number (3415152).

Almost surely, 2^51505047 is an apocalyptic number.

51505047 is a deficient number, since it is larger than the sum of its proper divisors (30458601).

51505047 is a wasteful number, since it uses less digits than its factorization.

51505047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5171 (or 5168 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 51505047 is about 7176.7016797412. The cubic root of 51505047 is about 372.0630963040.

The spelling of 51505047 in words is "fifty-one million, five hundred five thousand, forty-seven".