11001001901 has 2 divisors, whose sum is σ = 11001001902. Its totient is φ = 11001001900.

The previous prime is 11001001889. The next prime is 11001001933. The reversal of 11001001901 is 10910010011.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10660562500 + 340439401 = 103250^2 + 18451^2 .

It is a cyclic number.

It is not a de Polignac number, because 11001001901 - 2¹⁰ = 11001000877 is a prime.

It is a super-2 number, since 2×11001001901² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11001001981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5500500950 + 5500500951.

It is an arithmetic number, because the mean of its divisors is an integer number (5500500951).

Almost surely, 2^11001001901 is an apocalyptic number.

It is an amenable number.

11001001901 is a deficient number, since it is larger than the sum of its proper divisors (1).

11001001901 is an equidigital number, since it uses as much as digits as its factorization.

11001001901 is an odious number, because the sum of its binary digits is odd.

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

Adding to 11001001901 its reverse (10910010011), we get a palindrome (21911011912).

It can be divided in two parts, 1100 and 1001901, that added together give a palindrome (1003001).

The spelling of 11001001901 in words is "eleven billion, one million, one thousand, nine hundred one".