11505591001 has 16 divisors (see below), whose sum is σ = 12134244096. Its totient is φ = 10887852096.

The previous prime is 11505590977. The next prime is 11505591049. The reversal of 11505591001 is 10019550511.

It is a cyclic number.

It is not a de Polignac number, because 11505591001 - 2¹⁷ = 11505459929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11505591061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3535291 + ... + 3538543.

It is an arithmetic number, because the mean of its divisors is an integer number (758390256).

Almost surely, 2^11505591001 is an apocalyptic number.

It is an amenable number.

11505591001 is a deficient number, since it is larger than the sum of its proper divisors (628653095).

11505591001 is a wasteful number, since it uses less digits than its factorization.

11505591001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4872.

The product of its (nonzero) digits is 1125, while the sum is 28.

The spelling of 11505591001 in words is "eleven billion, five hundred five million, five hundred ninety-one thousand, one".