51917609 has 8 divisors (see below), whose sum is σ = 55093248. Its totient is φ = 48755520.

The previous prime is 51917599. The next prime is 51917611. The reversal of 51917609 is 90671915.

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 51917609 - 2⁸ = 51917353 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 (51917659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5144 + ... + 11414.

It is an arithmetic number, because the mean of its divisors is an integer number (6886656).

Almost surely, 2^51917609 is an apocalyptic number.

It is an amenable number.

51917609 is a deficient number, since it is larger than the sum of its proper divisors (3175639).

51917609 is a wasteful number, since it uses less digits than its factorization.

51917609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6775.

The product of its (nonzero) digits is 17010, while the sum is 38.

The square root of 51917609 is about 7205.3874982543. The cubic root of 51917609 is about 373.0538798557.

The spelling of 51917609 in words is "fifty-one million, nine hundred seventeen thousand, six hundred nine".