51320563 has 4 divisors (see below), whose sum is σ = 58652080. Its totient is φ = 43989048.

The previous prime is 51320527. The next prime is 51320597. The reversal of 51320563 is 36502315.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 51320563 - 2¹⁷ = 51189491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51320513) 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, 3665748 + ... + 3665761.

It is an arithmetic number, because the mean of its divisors is an integer number (14663020).

Almost surely, 2^51320563 is an apocalyptic number.

51320563 is a deficient number, since it is larger than the sum of its proper divisors (7331517).

51320563 is an equidigital number, since it uses as much as digits as its factorization.

51320563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7331516.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 51320563 is about 7163.8371701205. The cubic root of 51320563 is about 371.6183385674.

Adding to 51320563 its reverse (36502315), we get a palindrome (87822878).

The spelling of 51320563 in words is "fifty-one million, three hundred twenty thousand, five hundred sixty-three".