51636623 has 16 divisors (see below), whose sum is σ = 56121600. Its totient is φ = 47355840.

The previous prime is 51636601. The next prime is 51636647. The reversal of 51636623 is 32663615.

It is a cyclic number.

It is not a de Polignac number, because 51636623 - 2¹⁰ = 51635599 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 51636623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51636023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81518 + ... + 82148.

It is an arithmetic number, because the mean of its divisors is an integer number (3507600).

Almost surely, 2^51636623 is an apocalyptic number.

51636623 is a deficient number, since it is larger than the sum of its proper divisors (4484977).

51636623 is a wasteful number, since it uses less digits than its factorization.

51636623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782.

The product of its digits is 19440, while the sum is 32.

The square root of 51636623 is about 7185.8627178648. The cubic root of 51636623 is about 372.3796539298.

The spelling of 51636623 in words is "fifty-one million, six hundred thirty-six thousand, six hundred twenty-three".