51145647 has 16 divisors (see below), whose sum is σ = 80624640. Its totient is φ = 28217952.

The previous prime is 51145643. The next prime is 51145667. The reversal of 51145647 is 74654115.

It is not a de Polignac number, because 51145647 - 2² = 51145643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51145643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41383 + ... + 42600.

It is an arithmetic number, because the mean of its divisors is an integer number (5039040).

Almost surely, 2^51145647 is an apocalyptic number.

51145647 is a deficient number, since it is larger than the sum of its proper divisors (29478993).

51145647 is a wasteful number, since it uses less digits than its factorization.

51145647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84022.

The product of its digits is 16800, while the sum is 33.

The square root of 51145647 is about 7151.6184881466. The cubic root of 51145647 is about 371.1956621036.

The spelling of 51145647 in words is "fifty-one million, one hundred forty-five thousand, six hundred forty-seven".