111567161 has 4 divisors (see below), whose sum is σ = 112128000. Its totient is φ = 111006324.

The previous prime is 111567151. The next prime is 111567163. The reversal of 111567161 is 161765111.

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 111567161 - 2⁶ = 111567097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111567163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280121 + ... + 280518.

It is an arithmetic number, because the mean of its divisors is an integer number (28032000).

Almost surely, 2^111567161 is an apocalyptic number.

It is an amenable number.

111567161 is a deficient number, since it is larger than the sum of its proper divisors (560839).

111567161 is an equidigital number, since it uses as much as digits as its factorization.

111567161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560838.

The product of its digits is 1260, while the sum is 29.

The square root of 111567161 is about 10562.5357277502. The cubic root of 111567161 is about 481.4066966881.

The spelling of 111567161 in words is "one hundred eleven million, five hundred sixty-seven thousand, one hundred sixty-one".