91875169 has 2 divisors, whose sum is σ = 91875170. Its totient is φ = 91875168.

The previous prime is 91875143. The next prime is 91875197. The reversal of 91875169 is 96157819.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68690944 + 23184225 = 8288^2 + 4815^2 .

It is an emirp because it is prime and its reverse (96157819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91875169 - 2¹¹ = 91873121 is a prime.

It is a super-2 number, since 2×91875169² = 16882093357557122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91875109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45937584 + 45937585.

It is an arithmetic number, because the mean of its divisors is an integer number (45937585).

Almost surely, 2^91875169 is an apocalyptic number.

It is an amenable number.

91875169 is a deficient number, since it is larger than the sum of its proper divisors (1).

91875169 is an equidigital number, since it uses as much as digits as its factorization.

91875169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 46.

The square root of 91875169 is about 9585.1535720613. The cubic root of 91875169 is about 451.2314729594.

The spelling of 91875169 in words is "ninety-one million, eight hundred seventy-five thousand, one hundred sixty-nine".