51002823 has 4 divisors (see below), whose sum is σ = 68003768. Its totient is φ = 34001880.

The previous prime is 51002813. The next prime is 51002857. The reversal of 51002823 is 32820015.

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

It is not a de Polignac number, because 51002823 - 2¹³ = 50994631 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 51002823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51002813) 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, 8500468 + ... + 8500473.

It is an arithmetic number, because the mean of its divisors is an integer number (17000942).

Almost surely, 2^51002823 is an apocalyptic number.

51002823 is a deficient number, since it is larger than the sum of its proper divisors (17000945).

51002823 is a wasteful number, since it uses less digits than its factorization.

51002823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17000944.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 51002823 is about 7141.6260753417. The cubic root of 51002823 is about 370.8498192169.

Adding to 51002823 its reverse (32820015), we get a palindrome (83822838).

The spelling of 51002823 in words is "fifty-one million, two thousand, eight hundred twenty-three".