1001111001111 has 24 divisors (see below), whose sum is σ = 1564664309936. Its totient is φ = 613148538240.

The previous prime is 1001111001067. The next prime is 1001111001113. The reversal of 1001111001111 is 1111001111001.

It is not a de Polignac number, because 1001111001111 - 2⁶ = 1001111001047 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1001111001093 and 1001111001102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001111001113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20251390 + ... + 20300763.

Almost surely, 2^{1001111001111} is an apocalyptic number.

1001111001111 is a deficient number, since it is larger than the sum of its proper divisors (563553308825).

1001111001111 is a wasteful number, since it uses less digits than its factorization.

1001111001111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40552383 (or 40552380 counting only the distinct ones).

The product of its (nonzero) digits is 1, while the sum is 9.

Adding to 1001111001111 its reverse (1111001111001), we get a palindrome (2112112112112).

It can be divided in two parts, 1001111001 and 111, that multiplied together give a palindrome (111123321111).

The spelling of 1001111001111 in words is "one trillion, one billion, one hundred eleven million, one thousand, one hundred eleven".