51563647 has 4 divisors (see below), whose sum is σ = 52536600. Its totient is φ = 50590696.

The previous prime is 51563627. The next prime is 51563671. The reversal of 51563647 is 74636515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74636515 = 5 ⋅14927303.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51563647 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 (51563627) 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, 486397 + ... + 486502.

It is an arithmetic number, because the mean of its divisors is an integer number (13134150).

Almost surely, 2^51563647 is an apocalyptic number.

51563647 is a deficient number, since it is larger than the sum of its proper divisors (972953).

51563647 is an equidigital number, since it uses as much as digits as its factorization.

51563647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972952.

The product of its digits is 75600, while the sum is 37.

The square root of 51563647 is about 7180.7831745569. The cubic root of 51563647 is about 372.2041480725.

The spelling of 51563647 in words is "fifty-one million, five hundred sixty-three thousand, six hundred forty-seven".