111011001001 has 2 divisors, whose sum is σ = 111011001002. Its totient is φ = 111011001000.

The previous prime is 111011000963. The next prime is 111011001019. The reversal of 111011001001 is 100100110111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86626616976 + 24384384025 = 294324^2 + 156155^2 .

It is a cyclic number.

It is not a de Polignac number, because 111011001001 - 2⁷ = 111011000873 is a prime.

It is not a weakly prime, because it can be changed into another prime (111011001061) 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 as a sum of consecutive naturals, namely, 55505500500 + 55505500501.

It is an arithmetic number, because the mean of its divisors is an integer number (55505500501).

Almost surely, 2^111011001001 is an apocalyptic number.

It is an amenable number.

111011001001 is a deficient number, since it is larger than the sum of its proper divisors (1).

111011001001 is an equidigital number, since it uses as much as digits as its factorization.

111011001001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1, while the sum is 7.

Adding to 111011001001 its reverse (100100110111), we get a palindrome (211111111112).

The spelling of 111011001001 in words is "one hundred eleven billion, eleven million, one thousand, one".