111101111151161 has 2 divisors, whose sum is σ = 111101111151162. Its totient is φ = 111101111151160.

The previous prime is 111101111151139. The next prime is 111101111151209. The reversal of 111101111151161 is 161151111101111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110759522335225 + 341588815936 = 10524235^2 + 584456^2 .

It is an emirp because it is prime and its reverse (161151111101111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111101111151161 - 2⁶ = 111101111151097 is a prime.

It is a super-2 number, since 2×111101111151161² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111101111151101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55550555575580 + 55550555575581.

It is an arithmetic number, because the mean of its divisors is an integer number (55550555575581).

Almost surely, 2^{111101111151161} is an apocalyptic number.

It is an amenable number.

111101111151161 is a deficient number, since it is larger than the sum of its proper divisors (1).

111101111151161 is an equidigital number, since it uses as much as digits as its factorization.

111101111151161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30, while the sum is 23.

Adding to 111101111151161 its reverse (161151111101111), we get a palindrome (272252222252272).

The spelling of 111101111151161 in words is "one hundred eleven trillion, one hundred one billion, one hundred eleven million, one hundred fifty-one thousand, one hundred sixty-one".