13805861 has 2 divisors, whose sum is σ = 13805862. Its totient is φ = 13805860.

The previous prime is 13805851. The next prime is 13805863. The reversal of 13805861 is 16850831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7896100 + 5909761 = 2810^2 + 2431^2 .

It is a cyclic number.

It is not a de Polignac number, because 13805861 - 2⁶ = 13805797 is a prime.

Together with 13805863, 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 (13805863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6902930 + 6902931.

It is an arithmetic number, because the mean of its divisors is an integer number (6902931).

Almost surely, 2^13805861 is an apocalyptic number.

It is an amenable number.

13805861 is a deficient number, since it is larger than the sum of its proper divisors (1).

13805861 is an equidigital number, since it uses as much as digits as its factorization.

13805861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 13805861 is about 3715.6239045415. The cubic root of 13805861 is about 239.8949829895.

The spelling of 13805861 in words is "thirteen million, eight hundred five thousand, eight hundred sixty-one".