51217123017 has 4 divisors (see below), whose sum is σ = 68289497360. Its totient is φ = 34144748676.

The previous prime is 51217123003. The next prime is 51217123037. The reversal of 51217123017 is 71032171215.

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 not a de Polignac number, because 51217123017 - 2⁷ = 51217122889 is a prime.

It is a super-2 number, since 2×51217123017² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51217123037) 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, 8536187167 + ... + 8536187172.

It is an arithmetic number, because the mean of its divisors is an integer number (17072374340).

Almost surely, 2^51217123017 is an apocalyptic number.

It is an amenable number.

51217123017 is a deficient number, since it is larger than the sum of its proper divisors (17072374343).

51217123017 is a wasteful number, since it uses less digits than its factorization.

51217123017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17072374342.

The product of its (nonzero) digits is 2940, while the sum is 30.

The spelling of 51217123017 in words is "fifty-one billion, two hundred seventeen million, one hundred twenty-three thousand, seventeen".