51589993 has 12 divisors (see below), whose sum is σ = 64630020. Its totient is φ = 40817952.

The previous prime is 51589969. The next prime is 51590009. The reversal of 51589993 is 39998515.

It is a happy number.

51589993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 30503529 + 21086464 = 5523^2 + 4592^2 .

It is not a de Polignac number, because 51589993 - 2⁵ = 51589961 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51589913) 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 11 ways as a sum of consecutive naturals, for example, 39858 + ... + 41131.

It is an arithmetic number, because the mean of its divisors is an integer number (5385835).

Almost surely, 2^51589993 is an apocalyptic number.

It is an amenable number.

51589993 is a deficient number, since it is larger than the sum of its proper divisors (13040027).

51589993 is a wasteful number, since it uses less digits than its factorization.

51589993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81016 (or 81009 counting only the distinct ones).

The product of its digits is 437400, while the sum is 49.

The square root of 51589993 is about 7182.6174198547. The cubic root of 51589993 is about 372.2675287772.

It can be divided in two parts, 5158 and 9993, that added together give a palindrome (15151).

The spelling of 51589993 in words is "fifty-one million, five hundred eighty-nine thousand, nine hundred ninety-three".