101001111111091 has 4 divisors (see below), whose sum is σ = 101007448650472. Its totient is φ = 100994773571712.

The previous prime is 101001111111053. The next prime is 101001111111101. The reversal of 101001111111091 is 190111111100101.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 101001111111091 - 2¹¹ = 101001111109043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101001111111011) 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, 3168745785 + ... + 3168777658.

It is an arithmetic number, because the mean of its divisors is an integer number (25251862162618).

Almost surely, 2^{101001111111091} is an apocalyptic number.

101001111111091 is a deficient number, since it is larger than the sum of its proper divisors (6337539381).

101001111111091 is an equidigital number, since it uses as much as digits as its factorization.

101001111111091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6337539380.

The product of its (nonzero) digits is 9, while the sum is 19.

Adding to 101001111111091 its reverse (190111111100101), we get a palindrome (291112222211192).

The spelling of 101001111111091 in words is "one hundred one trillion, one billion, one hundred eleven million, one hundred eleven thousand, ninety-one".