111111011111101 has 4 divisors (see below), whose sum is σ = 111127153935232. Its totient is φ = 111094868286972.

The previous prime is 111111011111053. The next prime is 111111011111129. The reversal of 111111011111101 is 101111110111111.

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 111111011111101 - 2¹¹ = 111111011109053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111011811101) 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, 8071401741 + ... + 8071415506.

It is an arithmetic number, because the mean of its divisors is an integer number (27781788483808).

Almost surely, 2^{111111011111101} is an apocalyptic number.

It is an amenable number.

111111011111101 is a deficient number, since it is larger than the sum of its proper divisors (16142824131).

111111011111101 is an equidigital number, since it uses as much as digits as its factorization.

111111011111101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16142824130.

The product of its (nonzero) digits is 1, while the sum is 13.

Adding to 111111011111101 its reverse (101111110111111), we get a palindrome (212222121222212).

It can be divided in two parts, 11111 and 1011111101, that multiplied together give a palindrome (11234455443211).

The spelling of 111111011111101 in words is "one hundred eleven trillion, one hundred eleven billion, eleven million, one hundred eleven thousand, one hundred one".