51745247 has 4 divisors (see below), whose sum is σ = 52454160. Its totient is φ = 51036336.

The previous prime is 51745219. The next prime is 51745259. The reversal of 51745247 is 74254715.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74254715 = 5 ⋅14850943.

It is a cyclic number.

It is not a de Polignac number, because 51745247 - 2¹⁰ = 51744223 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 (51745207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 354347 + ... + 354492.

It is an arithmetic number, because the mean of its divisors is an integer number (13113540).

Almost surely, 2^51745247 is an apocalyptic number.

51745247 is a deficient number, since it is larger than the sum of its proper divisors (708913).

51745247 is an equidigital number, since it uses as much as digits as its factorization.

51745247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708912.

The product of its digits is 39200, while the sum is 35.

The square root of 51745247 is about 7193.4169210466. The cubic root of 51745247 is about 372.6405865449.

The spelling of 51745247 in words is "fifty-one million, seven hundred forty-five thousand, two hundred forty-seven".