111710161 has 4 divisors (see below), whose sum is σ = 111765924. Its totient is φ = 111654400.

The previous prime is 111710129. The next prime is 111710189. The reversal of 111710161 is 161017111.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 43151761 + 68558400 = 6569^2 + 8280^2 .

It is a cyclic number.

It is not a de Polignac number, because 111710161 - 2⁵ = 111710129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111710191) 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, 24760 + ... + 28921.

It is an arithmetic number, because the mean of its divisors is an integer number (27941481).

Almost surely, 2^111710161 is an apocalyptic number.

It is an amenable number.

111710161 is a deficient number, since it is larger than the sum of its proper divisors (55763).

111710161 is an equidigital number, since it uses as much as digits as its factorization.

111710161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55762.

The product of its (nonzero) digits is 42, while the sum is 19.

The square root of 111710161 is about 10569.3027679218. The cubic root of 111710161 is about 481.6122881477.

Adding to 111710161 its reverse (161017111), we get a palindrome (272727272).

The spelling of 111710161 in words is "one hundred eleven million, seven hundred ten thousand, one hundred sixty-one".