91123320241 has 4 divisors (see below), whose sum is σ = 91521238900. Its totient is φ = 90725401584.

The previous prime is 91123320227. The next prime is 91123320257. The reversal of 91123320241 is 14202332119.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 78097891600 + 13025428641 = 279460^2 + 114129^2 .

It is a cyclic number.

It is not a de Polignac number, because 91123320241 - 2²⁷ = 90989102513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91123320271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198958986 + ... + 198959443.

It is an arithmetic number, because the mean of its divisors is an integer number (22880309725).

Almost surely, 2^91123320241 is an apocalyptic number.

It is an amenable number.

91123320241 is a deficient number, since it is larger than the sum of its proper divisors (397918659).

91123320241 is a wasteful number, since it uses less digits than its factorization.

91123320241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397918658.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 91123320241 in words is "ninety-one billion, one hundred twenty-three million, three hundred twenty thousand, two hundred forty-one".