111101111161 has 2 divisors, whose sum is σ = 111101111162. Its totient is φ = 111101111160.

The previous prime is 111101111137. The next prime is 111101111183. The reversal of 111101111161 is 161111101111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95941345536 + 15159765625 = 309744^2 + 123125^2 .

It is a cyclic number.

It is not a de Polignac number, because 111101111161 - 2¹¹ = 111101109113 is a prime.

It is not a weakly prime, because it can be changed into another prime (111101181161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55550555580 + 55550555581.

It is an arithmetic number, because the mean of its divisors is an integer number (55550555581).

Almost surely, 2^111101111161 is an apocalyptic number.

It is an amenable number.

111101111161 is a deficient number, since it is larger than the sum of its proper divisors (1).

111101111161 is an equidigital number, since it uses as much as digits as its factorization.

111101111161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6, while the sum is 16.

Adding to 111101111161 its reverse (161111101111), we get a palindrome (272212212272).

It can be divided in two parts, 111101111 and 161, that multiplied together give a palindrome (17887278871).

The spelling of 111101111161 in words is "one hundred eleven billion, one hundred one million, one hundred eleven thousand, one hundred sixty-one".