51145747 has 4 divisors (see below), whose sum is σ = 51220456. Its totient is φ = 51071040.

The previous prime is 51145711. The next prime is 51145751. The reversal of 51145747 is 74754115.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51145747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51445747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36318 + ... + 37699.

It is an arithmetic number, because the mean of its divisors is an integer number (12805114).

Almost surely, 2^51145747 is an apocalyptic number.

51145747 is a deficient number, since it is larger than the sum of its proper divisors (74709).

51145747 is an equidigital number, since it uses as much as digits as its factorization.

51145747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74708.

The product of its digits is 19600, while the sum is 34.

The square root of 51145747 is about 7151.6254795676. The cubic root of 51145747 is about 371.1959040241.

The spelling of 51145747 in words is "fifty-one million, one hundred forty-five thousand, seven hundred forty-seven".