11111120129 has 4 divisors (see below), whose sum is σ = 11138829060. Its totient is φ = 11083411200.

The previous prime is 11111120123. The next prime is 11111120131. The reversal of 11111120129 is 92102111111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92102111111 = 1087 ⋅84730553.

It can be written as a sum of positive squares in 2 ways, for example, as 9458535025 + 1652585104 = 97255^2 + 40652^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111120129 - 2²⁴ = 11094342913 is a prime.

It is a super-3 number, since 3×11111120129³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11111120129.

It is not an unprimeable number, because it can be changed into a prime (11111120123) 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, 13853864 + ... + 13854665.

It is an arithmetic number, because the mean of its divisors is an integer number (2784707265).

Almost surely, 2^11111120129 is an apocalyptic number.

It is an amenable number.

11111120129 is a deficient number, since it is larger than the sum of its proper divisors (27708931).

11111120129 is an equidigital number, since it uses as much as digits as its factorization.

11111120129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27708930.

The product of its (nonzero) digits is 36, while the sum is 20.

The spelling of 11111120129 in words is "eleven billion, one hundred eleven million, one hundred twenty thousand, one hundred twenty-nine".