91134490217 has 2 divisors, whose sum is σ = 91134490218. Its totient is φ = 91134490216.

The previous prime is 91134490211. The next prime is 91134490231. The reversal of 91134490217 is 71209443119.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77141729536 + 13992760681 = 277744^2 + 118291^2 .

It is a cyclic number.

It is not a de Polignac number, because 91134490217 - 2⁴ = 91134490201 is a prime.

It is a super-2 number, since 2×91134490217² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91134490211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45567245108 + 45567245109.

It is an arithmetic number, because the mean of its divisors is an integer number (45567245109).

Almost surely, 2^91134490217 is an apocalyptic number.

It is an amenable number.

91134490217 is a deficient number, since it is larger than the sum of its proper divisors (1).

91134490217 is an equidigital number, since it uses as much as digits as its factorization.

91134490217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The spelling of 91134490217 in words is "ninety-one billion, one hundred thirty-four million, four hundred ninety thousand, two hundred seventeen".