91189669 has 2 divisors, whose sum is σ = 91189670. Its totient is φ = 91189668.

The previous prime is 91189663. The next prime is 91189697. The reversal of 91189669 is 96698119.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90973444 + 216225 = 9538^2 + 465^2 .

It is a cyclic number.

It is not a de Polignac number, because 91189669 - 2⁹ = 91189157 is a prime.

It is a super-2 number, since 2×91189669² = 16631111464659122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91189663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45594834 + 45594835.

It is an arithmetic number, because the mean of its divisors is an integer number (45594835).

Almost surely, 2^91189669 is an apocalyptic number.

It is an amenable number.

91189669 is a deficient number, since it is larger than the sum of its proper divisors (1).

91189669 is an equidigital number, since it uses as much as digits as its factorization.

91189669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 49.

The square root of 91189669 is about 9549.3281962660. The cubic root of 91189669 is about 450.1064258569.

The spelling of 91189669 in words is "ninety-one million, one hundred eighty-nine thousand, six hundred sixty-nine".