91819097 has 2 divisors, whose sum is σ = 91819098. Its totient is φ = 91819096.

The previous prime is 91819087. The next prime is 91819099. The reversal of 91819097 is 79091819.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68740681 + 23078416 = 8291^2 + 4804^2 .

It is a cyclic number.

It is not a de Polignac number, because 91819097 - 2¹² = 91815001 is a prime.

Together with 91819099, 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 (91819099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45909548 + 45909549.

It is an arithmetic number, because the mean of its divisors is an integer number (45909549).

Almost surely, 2^91819097 is an apocalyptic number.

It is an amenable number.

91819097 is a deficient number, since it is larger than the sum of its proper divisors (1).

91819097 is an equidigital number, since it uses as much as digits as its factorization.

91819097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 44.

The square root of 91819097 is about 9582.2281855527. The cubic root of 91819097 is about 451.1396577991.

The spelling of 91819097 in words is "ninety-one million, eight hundred nineteen thousand, ninety-seven".