91517771 has 2 divisors, whose sum is σ = 91517772. Its totient is φ = 91517770.

The previous prime is 91517747. The next prime is 91517773. The reversal of 91517771 is 17771519.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91517771 - 2¹⁴ = 91501387 is a prime.

It is a Sophie Germain prime.

Together with 91517773, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91517773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45758885 + 45758886.

It is an arithmetic number, because the mean of its divisors is an integer number (45758886).

Almost surely, 2^91517771 is an apocalyptic number.

91517771 is a deficient number, since it is larger than the sum of its proper divisors (1).

91517771 is an equidigital number, since it uses as much as digits as its factorization.

91517771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15435, while the sum is 38.

The square root of 91517771 is about 9566.4920948067. The cubic root of 91517771 is about 450.6456099333.

The spelling of 91517771 in words is "ninety-one million, five hundred seventeen thousand, seven hundred seventy-one".