111722161 has 2 divisors, whose sum is σ = 111722162. Its totient is φ = 111722160.

The previous prime is 111722153. The next prime is 111722167. The reversal of 111722161 is 161227111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108680625 + 3041536 = 10425^2 + 1744^2 .

It is a cyclic number.

It is not a de Polignac number, because 111722161 - 2³ = 111722153 is a prime.

It is not a weakly prime, because it can be changed into another prime (111722167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55861080 + 55861081.

It is an arithmetic number, because the mean of its divisors is an integer number (55861081).

Almost surely, 2^111722161 is an apocalyptic number.

It is an amenable number.

111722161 is a deficient number, since it is larger than the sum of its proper divisors (1).

111722161 is an equidigital number, since it uses as much as digits as its factorization.

111722161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 168, while the sum is 22.

The square root of 111722161 is about 10569.8704343998. The cubic root of 111722161 is about 481.6295325967.

Multiplying 111722161 by its sum of digits (22), we get a palindrome (2457887542).

Adding to 111722161 its reverse (161227111), we get a palindrome (272949272).

The spelling of 111722161 in words is "one hundred eleven million, seven hundred twenty-two thousand, one hundred sixty-one".