91039118617 has 2 divisors, whose sum is σ = 91039118618. Its totient is φ = 91039118616.

The previous prime is 91039118561. The next prime is 91039118629. The reversal of 91039118617 is 71681193019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82684427401 + 8354691216 = 287549^2 + 91404^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91039118617 is a prime.

It is a super-3 number, since 3×91039118617³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (91039118647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45519559308 + 45519559309.

It is an arithmetic number, because the mean of its divisors is an integer number (45519559309).

Almost surely, 2^91039118617 is an apocalyptic number.

It is an amenable number.

91039118617 is a deficient number, since it is larger than the sum of its proper divisors (1).

91039118617 is an equidigital number, since it uses as much as digits as its factorization.

91039118617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 46.

The spelling of 91039118617 in words is "ninety-one billion, thirty-nine million, one hundred eighteen thousand, six hundred seventeen".