11381861 has 2 divisors, whose sum is σ = 11381862. Its totient is φ = 11381860.

The previous prime is 11381837. The next prime is 11381863. The reversal of 11381861 is 16818311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9572836 + 1809025 = 3094^2 + 1345^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11381861 is a prime.

It is a Sophie Germain prime.

Together with 11381863, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11381863) 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, 5690930 + 5690931.

It is an arithmetic number, because the mean of its divisors is an integer number (5690931).

Almost surely, 2^11381861 is an apocalyptic number.

It is an amenable number.

11381861 is a deficient number, since it is larger than the sum of its proper divisors (1).

11381861 is an equidigital number, since it uses as much as digits as its factorization.

11381861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 29.

The square root of 11381861 is about 3373.7013797905. The cubic root of 11381861 is about 224.9422798443.

The spelling of 11381861 in words is "eleven million, three hundred eighty-one thousand, eight hundred sixty-one".