51232009 has 8 divisors (see below), whose sum is σ = 53869320. Its totient is φ = 48652800.

The previous prime is 51232003. The next prime is 51232039. The reversal of 51232009 is 90023215.

51232009 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 4 ways, for example, as 6969600 + 44262409 = 2640^2 + 6653^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51232009 - 2¹¹ = 51229961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51232003) 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 7 ways as a sum of consecutive naturals, for example, 12712 + ... + 16249.

It is an arithmetic number, because the mean of its divisors is an integer number (6733665).

Almost surely, 2^51232009 is an apocalyptic number.

It is an amenable number.

51232009 is a deficient number, since it is larger than the sum of its proper divisors (2637311).

51232009 is a wasteful number, since it uses less digits than its factorization.

51232009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29051.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 51232009 is about 7157.6538753980. The cubic root of 51232009 is about 371.4044721403.

The spelling of 51232009 in words is "fifty-one million, two hundred thirty-two thousand, nine".