1171606111 has 16 divisors (see below), whose sum is σ = 1270352160. Its totient is φ = 1074124800.

The previous prime is 1171606099. The next prime is 1171606123. The reversal of 1171606111 is 1116061711.

It is an interprime number because it is at equal distance from previous prime (1171606099) and next prime (1171606123).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1171606111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1171606141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1975431 + ... + 1976023.

It is an arithmetic number, because the mean of its divisors is an integer number (79397010).

Almost surely, 2^1171606111 is an apocalyptic number.

1171606111 is a deficient number, since it is larger than the sum of its proper divisors (98746049).

1171606111 is a wasteful number, since it uses less digits than its factorization.

1171606111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386.

The product of its (nonzero) digits is 252, while the sum is 25.

The square root of 1171606111 is about 34228.7322435407. The cubic root of 1171606111 is about 1054.2101890978.

Adding to 1171606111 its reverse (1116061711), we get a palindrome (2287667822).

The spelling of 1171606111 in words is "one billion, one hundred seventy-one million, six hundred six thousand, one hundred eleven".