91966909 has 2 divisors, whose sum is σ = 91966910. Its totient is φ = 91966908.

The previous prime is 91966877. The next prime is 91966937. The reversal of 91966909 is 90966919.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87946884 + 4020025 = 9378^2 + 2005^2 .

It is an emirp because it is prime and its reverse (90966919) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91966909 - 2⁵ = 91966877 is a prime.

It is a super-3 number, since 3×91966909³ (a number of 25 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91966999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45983454 + 45983455.

It is an arithmetic number, because the mean of its divisors is an integer number (45983455).

Almost surely, 2^91966909 is an apocalyptic number.

It is an amenable number.

91966909 is a deficient number, since it is larger than the sum of its proper divisors (1).

91966909 is an equidigital number, since it uses as much as digits as its factorization.

91966909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 236196, while the sum is 49.

The square root of 91966909 is about 9589.9379038657. The cubic root of 91966909 is about 451.3816122010.

The spelling of 91966909 in words is "ninety-one million, nine hundred sixty-six thousand, nine hundred nine".