51529689 has 20 divisors (see below), whose sum is σ = 78245860. Its totient is φ = 33786720.

The previous prime is 51529651. The next prime is 51529693. The reversal of 51529689 is 98692515.

51529689 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 27910089 + 23619600 = 5283^2 + 4860^2 .

It is a de Polignac number, because none of the positive numbers 2^k-51529689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51529619) 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 19 ways as a sum of consecutive naturals, for example, 274 + ... + 10155.

It is an arithmetic number, because the mean of its divisors is an integer number (3912293).

Almost surely, 2^51529689 is an apocalyptic number.

It is an amenable number.

51529689 is a deficient number, since it is larger than the sum of its proper divisors (26716171).

51529689 is a wasteful number, since it uses less digits than its factorization.

51529689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10502 (or 10493 counting only the distinct ones).

The product of its digits is 194400, while the sum is 45.

The square root of 51529689 is about 7178.4182798162. The cubic root of 51529689 is about 372.1224232863.

It can be divided in two parts, 5152 and 9689, that added together give a palindrome (14841).

The spelling of 51529689 in words is "fifty-one million, five hundred twenty-nine thousand, six hundred eighty-nine".