11868781 has 2 divisors, whose sum is σ = 11868782. Its totient is φ = 11868780.

The previous prime is 11868763. The next prime is 11868799. The reversal of 11868781 is 18786811.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (11868763) and next prime (11868799).

It can be written as a sum of positive squares in only one way, i.e., 6734025 + 5134756 = 2595^2 + 2266^2 .

It is an emirp because it is prime and its reverse (18786811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11868781 - 2⁷ = 11868653 is a prime.

It is a super-2 number, since 2×11868781² = 281735924851922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11868281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5934390 + 5934391.

It is an arithmetic number, because the mean of its divisors is an integer number (5934391).

Almost surely, 2^11868781 is an apocalyptic number.

It is an amenable number.

11868781 is a deficient number, since it is larger than the sum of its proper divisors (1).

11868781 is an equidigital number, since it uses as much as digits as its factorization.

11868781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21504, while the sum is 40.

The square root of 11868781 is about 3445.1097224907. The cubic root of 11868781 is about 228.1052978794.

The spelling of 11868781 in words is "eleven million, eight hundred sixty-eight thousand, seven hundred eighty-one".