51405523 has 8 divisors (see below), whose sum is σ = 55428800. Its totient is φ = 47392128.

The previous prime is 51405521. The next prime is 51405527. The reversal of 51405523 is 32550415.

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 51405523 - 2¹ = 51405521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51405521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11158 + ... + 15076.

It is an arithmetic number, because the mean of its divisors is an integer number (6928600).

Almost surely, 2^51405523 is an apocalyptic number.

51405523 is a deficient number, since it is larger than the sum of its proper divisors (4023277).

51405523 is a wasteful number, since it uses less digits than its factorization.

51405523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4941.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 51405523 is about 7169.7645010140. The cubic root of 51405523 is about 371.8232940186.

Adding to 51405523 its reverse (32550415), we get a palindrome (83955938).

The spelling of 51405523 in words is "fifty-one million, four hundred five thousand, five hundred twenty-three".