91391011 has 4 divisors (see below), whose sum is σ = 91484224. Its totient is φ = 91297800.

The previous prime is 91390991. The next prime is 91391021. The reversal of 91391011 is 11019319.

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

It is a cyclic number.

It is not a de Polignac number, because 91391011 - 2¹¹ = 91388963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91391021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45120 + ... + 47101.

It is an arithmetic number, because the mean of its divisors is an integer number (22871056).

Almost surely, 2^91391011 is an apocalyptic number.

91391011 is a deficient number, since it is larger than the sum of its proper divisors (93213).

91391011 is an equidigital number, since it uses as much as digits as its factorization.

91391011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93212.

The product of its (nonzero) digits is 243, while the sum is 25.

The square root of 91391011 is about 9559.8645910912. The cubic root of 91391011 is about 450.4374527961.

The spelling of 91391011 in words is "ninety-one million, three hundred ninety-one thousand, eleven".