91075169 has 2 divisors, whose sum is σ = 91075170. Its totient is φ = 91075168.

The previous prime is 91075139. The next prime is 91075181. The reversal of 91075169 is 96157019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85840225 + 5234944 = 9265^2 + 2288^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91075169 is a prime.

It is a super-2 number, since 2×91075169² = 16589372816757122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91075139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45537584 + 45537585.

It is an arithmetic number, because the mean of its divisors is an integer number (45537585).

Almost surely, 2^91075169 is an apocalyptic number.

It is an amenable number.

91075169 is a deficient number, since it is larger than the sum of its proper divisors (1).

91075169 is an equidigital number, since it uses as much as digits as its factorization.

91075169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17010, while the sum is 38.

The square root of 91075169 is about 9543.3311270227. The cubic root of 91075169 is about 449.9179587062.

The spelling of 91075169 in words is "ninety-one million, seventy-five thousand, one hundred sixty-nine".