51755647 has 4 divisors (see below), whose sum is σ = 53425216. Its totient is φ = 50086080.

The previous prime is 51755623. The next prime is 51755657. The reversal of 51755647 is 74655715.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-51755647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51755657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 834738 + ... + 834799.

It is an arithmetic number, because the mean of its divisors is an integer number (13356304).

Almost surely, 2^51755647 is an apocalyptic number.

51755647 is a deficient number, since it is larger than the sum of its proper divisors (1669569).

51755647 is a wasteful number, since it uses less digits than its factorization.

51755647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1669568.

The product of its digits is 147000, while the sum is 40.

The square root of 51755647 is about 7194.1397678944. The cubic root of 51755647 is about 372.6655498843.

The spelling of 51755647 in words is "fifty-one million, seven hundred fifty-five thousand, six hundred forty-seven".