11387861 has 2 divisors, whose sum is σ = 11387862. Its totient is φ = 11387860.

The previous prime is 11387837. The next prime is 11387863. The reversal of 11387861 is 16878311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11015761 + 372100 = 3319^2 + 610^2 .

It is a cyclic number.

It is not a de Polignac number, because 11387861 - 2⁶ = 11387797 is a prime.

Together with 11387863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11387863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5693930 + 5693931.

It is an arithmetic number, because the mean of its divisors is an integer number (5693931).

Almost surely, 2^11387861 is an apocalyptic number.

It is an amenable number.

11387861 is a deficient number, since it is larger than the sum of its proper divisors (1).

11387861 is an equidigital number, since it uses as much as digits as its factorization.

11387861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 35.

The square root of 11387861 is about 3374.5904936748. The cubic root of 11387861 is about 224.9817993508.

The spelling of 11387861 in words is "eleven million, three hundred eighty-seven thousand, eight hundred sixty-one".