111001101001 has 4 divisors (see below), whose sum is σ = 126858401152. Its totient is φ = 95143800852.

The previous prime is 111001100941. The next prime is 111001101011. The reversal of 111001101001 is 100101100111.

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, and also an emirpimes, since its reverse is a distinct semiprime: 100101100111 = 223 ⋅448883857.

It is a cyclic number.

It is not a de Polignac number, because 111001101001 - 2²³ = 110992712393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (7), and also a Moran number because the ratio is a prime number: 15857300143 = 111001101001 / (1 + 1 + 1 + 0 + 0 + 1 + 1 + 0 + 1 + 0 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (111001101011) 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, 7928650065 + ... + 7928650078.

It is an arithmetic number, because the mean of its divisors is an integer number (31714600288).

Almost surely, 2^111001101001 is an apocalyptic number.

It is an amenable number.

111001101001 is a deficient number, since it is larger than the sum of its proper divisors (15857300151).

111001101001 is an equidigital number, since it uses as much as digits as its factorization.

111001101001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15857300150.

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

Adding to 111001101001 its reverse (100101100111), we get a palindrome (211102201112).

The spelling of 111001101001 in words is "one hundred eleven billion, one million, one hundred one thousand, one".