91816172011 has 2 divisors, whose sum is σ = 91816172012. Its totient is φ = 91816172010.

The previous prime is 91816171949. The next prime is 91816172023. The reversal of 91816172011 is 11027161819.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91816172011 is a prime.

It is not a weakly prime, because it can be changed into another prime (91816172311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45908086005 + 45908086006.

It is an arithmetic number, because the mean of its divisors is an integer number (45908086006).

Almost surely, 2^91816172011 is an apocalyptic number.

91816172011 is a deficient number, since it is larger than the sum of its proper divisors (1).

91816172011 is an equidigital number, since it uses as much as digits as its factorization.

91816172011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 37.

The spelling of 91816172011 in words is "ninety-one billion, eight hundred sixteen million, one hundred seventy-two thousand, eleven".