51684317 has 4 divisors (see below), whose sum is σ = 52167456. Its totient is φ = 51201180.

The previous prime is 51684299. The next prime is 51684319. The reversal of 51684317 is 71348615.

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 51684317 - 2⁶ = 51684253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51684319) 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, 241409 + ... + 241622.

It is an arithmetic number, because the mean of its divisors is an integer number (13041864).

Almost surely, 2^51684317 is an apocalyptic number.

It is an amenable number.

51684317 is a deficient number, since it is larger than the sum of its proper divisors (483139).

51684317 is a wasteful number, since it uses less digits than its factorization.

51684317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483138.

The product of its digits is 20160, while the sum is 35.

The square root of 51684317 is about 7189.1805513563. The cubic root of 51684317 is about 372.4942677376.

The spelling of 51684317 in words is "fifty-one million, six hundred eighty-four thousand, three hundred seventeen".