91873097 has 2 divisors, whose sum is σ = 91873098. Its totient is φ = 91873096.

The previous prime is 91873043. The next prime is 91873099. The reversal of 91873097 is 79037819.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59428681 + 32444416 = 7709^2 + 5696^2 .

It is a cyclic number.

It is not a de Polignac number, because 91873097 - 2²⁰ = 90824521 is a prime.

Together with 91873099, 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 (91873099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45936548 + 45936549.

It is an arithmetic number, because the mean of its divisors is an integer number (45936549).

Almost surely, 2^91873097 is an apocalyptic number.

It is an amenable number.

91873097 is a deficient number, since it is larger than the sum of its proper divisors (1).

91873097 is an equidigital number, since it uses as much as digits as its factorization.

91873097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 91873097 is about 9585.0454876333. The cubic root of 91873097 is about 451.2280808254.

The spelling of 91873097 in words is "ninety-one million, eight hundred seventy-three thousand, ninety-seven".