11000001001081 has 2 divisors, whose sum is σ = 11000001001082. Its totient is φ = 11000001001080.

The previous prime is 11000001001037. The next prime is 11000001001091. The reversal of 11000001001081 is 18010010000011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10945616429056 + 54384572025 = 3308416^2 + 233205^2 .

It is an emirp because it is prime and its reverse (18010010000011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11000001001081 - 2¹³ = 11000000992889 is a prime.

It is a super-2 number, since 2×11000001001081² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11000001001091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5500000500540 + 5500000500541.

It is an arithmetic number, because the mean of its divisors is an integer number (5500000500541).

Almost surely, 2^{11000001001081} is an apocalyptic number.

It is an amenable number.

11000001001081 is a deficient number, since it is larger than the sum of its proper divisors (1).

11000001001081 is an equidigital number, since it uses as much as digits as its factorization.

11000001001081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11000001001081 its reverse (18010010000011), we get a palindrome (29010011001092).

The spelling of 11000001001081 in words is "eleven trillion, one million, one thousand, eighty-one".