111141161 has 4 divisors (see below), whose sum is σ = 111354192. Its totient is φ = 110928132.

The previous prime is 111141157. The next prime is 111141187. The reversal of 111141161 is 161141111.

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: 161141111 = 41 ⋅3930271.

It is a cyclic number.

It is not a de Polignac number, because 111141161 - 2² = 111141157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111144161) 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, 105731 + ... + 106776.

It is an arithmetic number, because the mean of its divisors is an integer number (27838548).

Almost surely, 2^111141161 is an apocalyptic number.

It is an amenable number.

111141161 is a deficient number, since it is larger than the sum of its proper divisors (213031).

111141161 is an equidigital number, since it uses as much as digits as its factorization.

111141161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213030.

The product of its digits is 24, while the sum is 17.

The square root of 111141161 is about 10542.3508289186. The cubic root of 111141161 is about 480.7931923020.

Adding to 111141161 its reverse (161141111), we get a palindrome (272282272).

The spelling of 111141161 in words is "one hundred eleven million, one hundred forty-one thousand, one hundred sixty-one".