51021623 has 8 divisors (see below), whose sum is σ = 51678000. Its totient is φ = 50369728.

The previous prime is 51021601. The next prime is 51021637. The reversal of 51021623 is 32612015.

51021623 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 a de Polignac number, because none of the positive numbers 2^k-51021623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51021595 and 51021604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51021683) 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, 25715 + ... + 27627.

It is an arithmetic number, because the mean of its divisors is an integer number (6459750).

Almost surely, 2^51021623 is an apocalyptic number.

51021623 is a deficient number, since it is larger than the sum of its proper divisors (656377).

51021623 is a wasteful number, since it uses less digits than its factorization.

51021623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2241.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 51021623 is about 7142.9421809224. The cubic root of 51021623 is about 370.8953795717.

Adding to 51021623 its reverse (32612015), we get a palindrome (83633638).

The spelling of 51021623 in words is "fifty-one million, twenty-one thousand, six hundred twenty-three".