51631563 has 4 divisors (see below), whose sum is σ = 68842088. Its totient is φ = 34421040.

The previous prime is 51631543. The next prime is 51631577. The reversal of 51631563 is 36513615.

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

It is not a de Polignac number, because 51631563 - 2¹⁰ = 51630539 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51631563.

It is not an unprimeable number, because it can be changed into a prime (51631543) 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, 8605258 + ... + 8605263.

It is an arithmetic number, because the mean of its divisors is an integer number (17210522).

Almost surely, 2^51631563 is an apocalyptic number.

51631563 is a deficient number, since it is larger than the sum of its proper divisors (17210525).

51631563 is a wasteful number, since it uses less digits than its factorization.

51631563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17210524.

The product of its digits is 8100, while the sum is 30.

The square root of 51631563 is about 7185.5106290367. The cubic root of 51631563 is about 372.3674900657.

The spelling of 51631563 in words is "fifty-one million, six hundred thirty-one thousand, five hundred sixty-three".