51840717 has 4 divisors (see below), whose sum is σ = 69120960. Its totient is φ = 34560476.

The previous prime is 51840713. The next prime is 51840739. The reversal of 51840717 is 71704815.

51840717 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51840717 - 2² = 51840713 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51840713) 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 3 ways as a sum of consecutive naturals, for example, 8640117 + ... + 8640122.

It is an arithmetic number, because the mean of its divisors is an integer number (17280240).

Almost surely, 2^51840717 is an apocalyptic number.

It is an amenable number.

51840717 is a deficient number, since it is larger than the sum of its proper divisors (17280243).

51840717 is a wasteful number, since it uses less digits than its factorization.

51840717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17280242.

The product of its (nonzero) digits is 7840, while the sum is 33.

The square root of 51840717 is about 7200.0497914945. The cubic root of 51840717 is about 372.8696197542.

The spelling of 51840717 in words is "fifty-one million, eight hundred forty thousand, seven hundred seventeen".