91665797 has 2 divisors, whose sum is σ = 91665798. Its totient is φ = 91665796.

The previous prime is 91665767. The next prime is 91665803. The reversal of 91665797 is 79756619.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47761921 + 43903876 = 6911^2 + 6626^2 .

It is a cyclic number.

It is not a de Polignac number, because 91665797 - 2¹⁴ = 91649413 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91665727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45832898 + 45832899.

It is an arithmetic number, because the mean of its divisors is an integer number (45832899).

Almost surely, 2^91665797 is an apocalyptic number.

It is an amenable number.

91665797 is a deficient number, since it is larger than the sum of its proper divisors (1).

91665797 is an equidigital number, since it uses as much as digits as its factorization.

91665797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 714420, while the sum is 50.

The square root of 91665797 is about 9574.2256605952. The cubic root of 91665797 is about 450.8884455896. Note that the first 3 decimals are identical.

The spelling of 91665797 in words is "ninety-one million, six hundred sixty-five thousand, seven hundred ninety-seven".