51500017 has 4 divisors (see below), whose sum is σ = 51542500. Its totient is φ = 51457536.

The previous prime is 51500011. The next prime is 51500023. The reversal of 51500017 is 71000515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71000515 = 5 ⋅14200103.

It is an interprime number because it is at equal distance from previous prime (51500011) and next prime (51500023).

It can be written as a sum of positive squares in 2 ways, for example, as 20575296 + 30924721 = 4536^2 + 5561^2 .

It is a cyclic number.

It is not a de Polignac number, because 51500017 - 2¹⁵ = 51467249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51499967 and 51500003.

It is not an unprimeable number, because it can be changed into a prime (51500011) 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, 19368 + ... + 21865.

It is an arithmetic number, because the mean of its divisors is an integer number (12885625).

Almost surely, 2^51500017 is an apocalyptic number.

It is an amenable number.

51500017 is a deficient number, since it is larger than the sum of its proper divisors (42483).

51500017 is a wasteful number, since it uses less digits than its factorization.

51500017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42482.

The product of its (nonzero) digits is 175, while the sum is 19.

The square root of 51500017 is about 7176.3512316497. The cubic root of 51500017 is about 372.0509839745.

The spelling of 51500017 in words is "fifty-one million, five hundred thousand, seventeen".