91766197 has 2 divisors, whose sum is σ = 91766198. Its totient is φ = 91766196.

The previous prime is 91766189. The next prime is 91766243. The reversal of 91766197 is 79166719.

It is an a-pointer prime, because the next prime (91766243) can be obtained adding 91766197 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52403121 + 39363076 = 7239^2 + 6274^2 .

It is an emirp because it is prime and its reverse (79166719) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91766197 - 2³ = 91766189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91766177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45883098 + 45883099.

It is an arithmetic number, because the mean of its divisors is an integer number (45883099).

Almost surely, 2^91766197 is an apocalyptic number.

It is an amenable number.

91766197 is a deficient number, since it is larger than the sum of its proper divisors (1).

91766197 is an equidigital number, since it uses as much as digits as its factorization.

91766197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 142884, while the sum is 46.

The square root of 91766197 is about 9579.4674695413. The cubic root of 91766197 is about 451.0530023598.

The spelling of 91766197 in words is "ninety-one million, seven hundred sixty-six thousand, one hundred ninety-seven".