91236741121 has 4 divisors (see below), whose sum is σ = 91240735572. Its totient is φ = 91232746672.

The previous prime is 91236741073. The next prime is 91236741149. The reversal of 91236741121 is 12114763219.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12114763219 = 13 ⋅931904863.

It can be written as a sum of positive squares in 2 ways, for example, as 77375210896 + 13861530225 = 278164^2 + 117735^2 .

It is a cyclic number.

It is not a de Polignac number, because 91236741121 - 2¹¹ = 91236739073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91236741151) 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 in 3 ways as a sum of consecutive naturals, for example, 1962766 + ... + 2008711.

It is an arithmetic number, because the mean of its divisors is an integer number (22810183893).

Almost surely, 2^91236741121 is an apocalyptic number.

It is an amenable number.

91236741121 is a deficient number, since it is larger than the sum of its proper divisors (3994451).

91236741121 is a wasteful number, since it uses less digits than its factorization.

91236741121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3994450.

The product of its digits is 18144, while the sum is 37.

The spelling of 91236741121 in words is "ninety-one billion, two hundred thirty-six million, seven hundred forty-one thousand, one hundred twenty-one".