91112121 has 24 divisors (see below), whose sum is σ = 137204704. Its totient is φ = 60419520.

The previous prime is 91112111. The next prime is 91112143. The reversal of 91112121 is 12121119.

It is a happy number.

It is not a de Polignac number, because 91112121 - 2⁶ = 91112057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91112094 and 91112103.

It is not an unprimeable number, because it can be changed into a prime (91112111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50385 + ... + 52161.

Almost surely, 2^91112121 is an apocalyptic number.

It is an amenable number.

91112121 is a deficient number, since it is larger than the sum of its proper divisors (46092583).

91112121 is a wasteful number, since it uses less digits than its factorization.

91112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2003 (or 1991 counting only the distinct ones).

The product of its digits is 36, while the sum is 18.

The square root of 91112121 is about 9545.2669423123. The cubic root of 91112121 is about 449.9787990012.

The spelling of 91112121 in words is "ninety-one million, one hundred twelve thousand, one hundred twenty-one".