1111001001001 has 4 divisors (see below), whose sum is σ = 1111129493632. Its totient is φ = 1110872508372.

The previous prime is 1111001000971. The next prime is 1111001001013. The reversal of 1111001001001 is 1001001001111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1111001001001 - 2⁷ = 1111001000873 is a prime.

It is a Duffinian number.

1111001001001 is a modest number, since divided by 1001001 gives 1111 as remainder.

It is not an unprimeable number, because it can be changed into a prime (1111001001401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64233345 + ... + 64250638.

It is an arithmetic number, because the mean of its divisors is an integer number (277782373408).

Almost surely, 2^{1111001001001} is an apocalyptic number.

It is an amenable number.

1111001001001 is a deficient number, since it is larger than the sum of its proper divisors (128492631).

1111001001001 is an equidigital number, since it uses as much as digits as its factorization.

1111001001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128492630.

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

Adding to 1111001001001 its reverse (1001001001111), we get a palindrome (2112002002112).

It can be divided in two parts, 111 and 1001001001, that multiplied together give a palindrome (111111111111).

The spelling of 1111001001001 in words is "one trillion, one hundred eleven billion, one million, one thousand, one".