51350009 has 4 divisors (see below), whose sum is σ = 51821220. Its totient is φ = 50878800.

The previous prime is 51350003. The next prime is 51350017. The reversal of 51350009 is 90005315.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39100009 + 12250000 = 6253^2 + 3500^2 .

It is a cyclic number.

It is not a de Polignac number, because 51350009 - 2⁴ = 51349993 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 (51350003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235442 + ... + 235659.

It is an arithmetic number, because the mean of its divisors is an integer number (12955305).

Almost surely, 2^51350009 is an apocalyptic number.

It is an amenable number.

51350009 is a deficient number, since it is larger than the sum of its proper divisors (471211).

51350009 is a wasteful number, since it uses less digits than its factorization.

51350009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471210.

The product of its (nonzero) digits is 675, while the sum is 23.

The square root of 51350009 is about 7165.8920589135. The cubic root of 51350009 is about 371.6893989818.

The spelling of 51350009 in words is "fifty-one million, three hundred fifty thousand, nine".