51646389 has 16 divisors (see below), whose sum is σ = 73241280. Its totient is φ = 32279040.

The previous prime is 51646369. The next prime is 51646393. The reversal of 51646389 is 98364615.

51646389 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 51646389 - 2⁹ = 51645877 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51646389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51646349) 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 15 ways as a sum of consecutive naturals, for example, 859 + ... + 10199.

It is an arithmetic number, because the mean of its divisors is an integer number (4577580).

Almost surely, 2^51646389 is an apocalyptic number.

It is an amenable number.

51646389 is a deficient number, since it is larger than the sum of its proper divisors (21594891).

51646389 is a wasteful number, since it uses less digits than its factorization.

51646389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9460.

The product of its digits is 155520, while the sum is 42.

The square root of 51646389 is about 7186.5422144450. The cubic root of 51646389 is about 372.4031284217.

The spelling of 51646389 in words is "fifty-one million, six hundred forty-six thousand, three hundred eighty-nine".