91001011 has 4 divisors (see below), whose sum is σ = 91021032. Its totient is φ = 90980992.

The previous prime is 91000999. The next prime is 91001059. The reversal of 91001011 is 11010019.

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 91001011 - 2⁵ = 91000979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91000982 and 91001000.

It is not an unprimeable number, because it can be changed into a prime (91001111) 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, 456 + ... + 13498.

It is an arithmetic number, because the mean of its divisors is an integer number (22755258).

Almost surely, 2^91001011 is an apocalyptic number.

91001011 is a deficient number, since it is larger than the sum of its proper divisors (20021).

91001011 is a wasteful number, since it uses less digits than its factorization.

91001011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20020.

The product of its (nonzero) digits is 9, while the sum is 13.

The square root of 91001011 is about 9539.4450048208. The cubic root of 91001011 is about 449.7958102425.

The spelling of 91001011 in words is "ninety-one million, one thousand, eleven".