11869861 has 2 divisors, whose sum is σ = 11869862. Its totient is φ = 11869860.

The previous prime is 11869811. The next prime is 11869867. The reversal of 11869861 is 16896811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7667361 + 4202500 = 2769^2 + 2050^2 .

It is a cyclic number.

It is not a de Polignac number, because 11869861 - 2⁷ = 11869733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11869867) 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, 5934930 + 5934931.

It is an arithmetic number, because the mean of its divisors is an integer number (5934931).

Almost surely, 2^11869861 is an apocalyptic number.

It is an amenable number.

11869861 is a deficient number, since it is larger than the sum of its proper divisors (1).

11869861 is an equidigital number, since it uses as much as digits as its factorization.

11869861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 40.

The square root of 11869861 is about 3445.2664628443. The cubic root of 11869861 is about 228.1122164851.

The spelling of 11869861 in words is "eleven million, eight hundred sixty-nine thousand, eight hundred sixty-one".