51324809 has 16 divisors (see below), whose sum is σ = 56325120. Its totient is φ = 46630080.

The previous prime is 51324739. The next prime is 51324811. The reversal of 51324809 is 90842315.

51324809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51324809 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 (51324839) 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, 32492 + ... + 34034.

It is an arithmetic number, because the mean of its divisors is an integer number (3520320).

Almost surely, 2^51324809 is an apocalyptic number.

It is an amenable number.

51324809 is a deficient number, since it is larger than the sum of its proper divisors (5000311).

51324809 is a wasteful number, since it uses less digits than its factorization.

51324809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 51324809 is about 7164.1335135521. The cubic root of 51324809 is about 371.6285868829.

The spelling of 51324809 in words is "fifty-one million, three hundred twenty-four thousand, eight hundred nine".