117111161 has 2 divisors, whose sum is σ = 117111162. Its totient is φ = 117111160.

The previous prime is 117111157. The next prime is 117111191. The reversal of 117111161 is 161111711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114490000 + 2621161 = 10700^2 + 1619^2 .

It is a cyclic number.

It is not a de Polignac number, because 117111161 - 2² = 117111157 is a prime.

It is not a weakly prime, because it can be changed into another prime (117111131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58555580 + 58555581.

It is an arithmetic number, because the mean of its divisors is an integer number (58555581).

Almost surely, 2^117111161 is an apocalyptic number.

It is an amenable number.

117111161 is a deficient number, since it is larger than the sum of its proper divisors (1).

117111161 is an equidigital number, since it uses as much as digits as its factorization.

117111161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42, while the sum is 20.

The square root of 117111161 is about 10821.7910255188. The cubic root of 117111161 is about 489.2521717688.

Adding to 117111161 its reverse (161111711), we get a palindrome (278222872).

The spelling of 117111161 in words is "one hundred seventeen million, one hundred eleven thousand, one hundred sixty-one".