91001001011 has 4 divisors (see below), whose sum is σ = 95790527400. Its totient is φ = 86211474624.

The previous prime is 91001000999. The next prime is 91001001019. The reversal of 91001001011 is 11010010019.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91001001011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91001001019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2394763166 + ... + 2394763203.

It is an arithmetic number, because the mean of its divisors is an integer number (23947631850).

Almost surely, 2^91001001011 is an apocalyptic number.

91001001011 is a deficient number, since it is larger than the sum of its proper divisors (4789526389).

91001001011 is a wasteful number, since it uses less digits than its factorization.

91001001011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4789526388.

The product of its (nonzero) digits is 9, while the sum is 14.

The spelling of 91001001011 in words is "ninety-one billion, one million, one thousand, eleven".