11981117 has 2 divisors, whose sum is σ = 11981118. Its totient is φ = 11981116.

The previous prime is 11981113. The next prime is 11981131. The reversal of 11981117 is 71118911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8844676 + 3136441 = 2974^2 + 1771^2 .

It is an emirp because it is prime and its reverse (71118911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11981117 - 2² = 11981113 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11981117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11981113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5990558 + 5990559.

It is an arithmetic number, because the mean of its divisors is an integer number (5990559).

Almost surely, 2^11981117 is an apocalyptic number.

It is an amenable number.

11981117 is a deficient number, since it is larger than the sum of its proper divisors (1).

11981117 is an equidigital number, since it uses as much as digits as its factorization.

11981117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504, while the sum is 29.

The square root of 11981117 is about 3461.3750157994. The cubic root of 11981117 is about 228.8226985831.

The spelling of 11981117 in words is "eleven million, nine hundred eighty-one thousand, one hundred seventeen".