11080121581 has 4 divisors (see below), whose sum is σ = 11082218652. Its totient is φ = 11078024512.

The previous prime is 11080121561. The next prime is 11080121609. The reversal of 11080121581 is 18512108011.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3356348356 + 7723773225 = 57934^2 + 87885^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11080121581 is a prime.

It is a super-2 number, since 2×11080121581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11080121531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1040590 + ... + 1051183.

It is an arithmetic number, because the mean of its divisors is an integer number (2770554663).

Almost surely, 2^11080121581 is an apocalyptic number.

It is an amenable number.

11080121581 is a deficient number, since it is larger than the sum of its proper divisors (2097071).

11080121581 is an equidigital number, since it uses as much as digits as its factorization.

11080121581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2097070.

The product of its (nonzero) digits is 640, while the sum is 28.

Adding to 11080121581 its reverse (18512108011), we get a palindrome (29592229592).

The spelling of 11080121581 in words is "eleven billion, eighty million, one hundred twenty-one thousand, five hundred eighty-one".