1000000009911 has 16 divisors (see below), whose sum is σ = 1604010041600. Its totient is φ = 541353388608.

The previous prime is 1000000009909. The next prime is 1000000009913. The reversal of 1000000009911 is 1199000000001.

It is an interprime number because it is at equal distance from previous prime (1000000009909) and next prime (1000000009913).

It is not a de Polignac number, because 1000000009911 - 2¹ = 1000000009909 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000000009913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1253132446 + ... + 1253133243.

It is an arithmetic number, because the mean of its divisors is an integer number (100250627600).

Almost surely, 2^{1000000009911} is an apocalyptic number.

1000000009911 is a deficient number, since it is larger than the sum of its proper divisors (604010031689).

1000000009911 is a wasteful number, since it uses less digits than its factorization.

1000000009911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2506265718.

The product of its (nonzero) digits is 81, while the sum is 21.

Adding to 1000000009911 its reverse (1199000000001), we get a palindrome (2199000009912).

The spelling of 1000000009911 in words is "one trillion, nine thousand, nine hundred eleven".