185928989317 has 2 divisors, whose sum is σ = 185928989318. Its totient is φ = 185928989316.

The previous prime is 185928989291. The next prime is 185928989387. The reversal of 185928989317 is 713989829581.

185928989317 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (185928989387) can be obtained adding 185928989317 to its sum of digits (70).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128657798721 + 57271190596 = 358689^2 + 239314^2 .

It is a cyclic number.

It is not a de Polignac number, because 185928989317 - 2⁷ = 185928989189 is a prime.

It is a super-2 number, since 2×185928989317² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (185928989387) 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 as a sum of consecutive naturals, namely, 92964494658 + 92964494659.

It is an arithmetic number, because the mean of its divisors is an integer number (92964494659).

Almost surely, 2^185928989317 is an apocalyptic number.

It is an amenable number.

185928989317 is a deficient number, since it is larger than the sum of its proper divisors (1).

185928989317 is an equidigital number, since it uses as much as digits as its factorization.

185928989317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78382080, while the sum is 70.

The spelling of 185928989317 in words is "one hundred eighty-five billion, nine hundred twenty-eight million, nine hundred eighty-nine thousand, three hundred seventeen".