51864517 has 8 divisors (see below), whose sum is σ = 54647424. Its totient is φ = 49125648.

The previous prime is 51864511. The next prime is 51864521. The reversal of 51864517 is 71546815.

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 51864517 - 2¹⁹ = 51340229 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 (51864511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8578 + ... + 13315.

It is an arithmetic number, because the mean of its divisors is an integer number (6830928).

Almost surely, 2^51864517 is an apocalyptic number.

It is an amenable number.

51864517 is a deficient number, since it is larger than the sum of its proper divisors (2782907).

51864517 is a wasteful number, since it uses less digits than its factorization.

51864517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22019.

The product of its digits is 33600, while the sum is 37.

The square root of 51864517 is about 7201.7023681905. The cubic root of 51864517 is about 372.9266723295.

The spelling of 51864517 in words is "fifty-one million, eight hundred sixty-four thousand, five hundred seventeen".