51217123417 has 4 divisors (see below), whose sum is σ = 51391926180. Its totient is φ = 51042320656.

The previous prime is 51217123381. The next prime is 51217123471. The reversal of 51217123417 is 71432171215.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31600039696 + 19617083721 = 177764^2 + 140061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51217123417 is a prime.

It is a super-2 number, since 2×51217123417² (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 (51217120417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87400942 + ... + 87401527.

It is an arithmetic number, because the mean of its divisors is an integer number (12847981545).

Almost surely, 2^51217123417 is an apocalyptic number.

It is an amenable number.

51217123417 is a deficient number, since it is larger than the sum of its proper divisors (174802763).

51217123417 is a wasteful number, since it uses less digits than its factorization.

51217123417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174802762.

The product of its digits is 11760, while the sum is 34.

The spelling of 51217123417 in words is "fifty-one billion, two hundred seventeen million, one hundred twenty-three thousand, four hundred seventeen".