91011121 has 8 divisors (see below), whose sum is σ = 96558080. Its totient is φ = 85539888.

The previous prime is 91011079. The next prime is 91011127. The reversal of 91011121 is 12111019.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91011121 - 2⁷ = 91010993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91011095 and 91011104.

It is not an unprimeable number, because it can be changed into a prime (91011127) 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 7 ways as a sum of consecutive naturals, for example, 16446 + ... + 21271.

It is an arithmetic number, because the mean of its divisors is an integer number (12069760).

Almost surely, 2^91011121 is an apocalyptic number.

It is an amenable number.

91011121 is a deficient number, since it is larger than the sum of its proper divisors (5546959).

91011121 is a wasteful number, since it uses less digits than its factorization.

91011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37863.

The product of its (nonzero) digits is 18, while the sum is 16.

The square root of 91011121 is about 9539.9748951452. The cubic root of 91011121 is about 449.8124667141.

The spelling of 91011121 in words is "ninety-one million, eleven thousand, one hundred twenty-one".