51319989 has 12 divisors (see below), whose sum is σ = 84718816. Its totient is φ = 29325672.

The previous prime is 51319963. The next prime is 51319993. The reversal of 51319989 is 98991315.

51319989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51319989 - 2¹¹ = 51317941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51319189) 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, 407239 + ... + 407364.

Almost surely, 2^51319989 is an apocalyptic number.

It is an amenable number.

51319989 is a deficient number, since it is larger than the sum of its proper divisors (33398827).

51319989 is a wasteful number, since it uses less digits than its factorization.

51319989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814616 (or 814613 counting only the distinct ones).

The product of its digits is 87480, while the sum is 45.

The square root of 51319989 is about 7163.7971076797. The cubic root of 51319989 is about 371.6169530947.

It can be divided in two parts, 513 and 19989, that added together give a palindrome (20502).

The spelling of 51319989 in words is "fifty-one million, three hundred nineteen thousand, nine hundred eighty-nine".