51405563 has 8 divisors (see below), whose sum is σ = 56168256. Its totient is φ = 46657800.

The previous prime is 51405539. The next prime is 51405577. The reversal of 51405563 is 36550415.

51405563 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51405563 - 2⁶ = 51405499 is a prime.

It is a super-3 number, since 3×51405563³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51405503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4220 + ... + 10982.

It is an arithmetic number, because the mean of its divisors is an integer number (7021032).

Almost surely, 2^51405563 is an apocalyptic number.

51405563 is a deficient number, since it is larger than the sum of its proper divisors (4762693).

51405563 is a wasteful number, since it uses less digits than its factorization.

51405563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7465.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 51405563 is about 7169.7672905053. The cubic root of 51405563 is about 371.8233904604.

Adding to 51405563 its reverse (36550415), we get a palindrome (87955978).

The spelling of 51405563 in words is "fifty-one million, four hundred five thousand, five hundred sixty-three".