11181778241 has 2 divisors, whose sum is σ = 11181778242. Its totient is φ = 11181778240.

The previous prime is 11181778183. The next prime is 11181778243. The reversal of 11181778241 is 14287718111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9980809216 + 1200969025 = 99904^2 + 34655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11181778241 is a prime.

Together with 11181778243, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11181778243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5590889120 + 5590889121.

It is an arithmetic number, because the mean of its divisors is an integer number (5590889121).

Almost surely, 2^11181778241 is an apocalyptic number.

It is an amenable number.

11181778241 is a deficient number, since it is larger than the sum of its proper divisors (1).

11181778241 is an equidigital number, since it uses as much as digits as its factorization.

11181778241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25088, while the sum is 41.

The spelling of 11181778241 in words is "eleven billion, one hundred eighty-one million, seven hundred seventy-eight thousand, two hundred forty-one".