11865869 has 2 divisors, whose sum is σ = 11865870. Its totient is φ = 11865868.

The previous prime is 11865853. The next prime is 11865871. The reversal of 11865869 is 96856811.

11865869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11812969 + 52900 = 3437^2 + 230^2 .

It is a cyclic number.

It is not a de Polignac number, because 11865869 - 2⁴ = 11865853 is a prime.

It is a super-2 number, since 2×11865869² = 281597694250322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 11865871, 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 (11865809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5932934 + 5932935.

It is an arithmetic number, because the mean of its divisors is an integer number (5932935).

Almost surely, 2^11865869 is an apocalyptic number.

It is an amenable number.

11865869 is a deficient number, since it is larger than the sum of its proper divisors (1).

11865869 is an equidigital number, since it uses as much as digits as its factorization.

11865869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 44.

The square root of 11865869 is about 3444.6870685158. The cubic root of 11865869 is about 228.0866411766.

The spelling of 11865869 in words is "eleven million, eight hundred sixty-five thousand, eight hundred sixty-nine".