13603861 has 2 divisors, whose sum is σ = 13603862. Its totient is φ = 13603860.

The previous prime is 13603853. The next prime is 13603903. The reversal of 13603861 is 16830631.

13603861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13003236 + 600625 = 3606^2 + 775^2 .

It is a cyclic number.

It is not a de Polignac number, because 13603861 - 2³ = 13603853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13603361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6801930 + 6801931.

It is an arithmetic number, because the mean of its divisors is an integer number (6801931).

Almost surely, 2^13603861 is an apocalyptic number.

It is an amenable number.

13603861 is a deficient number, since it is larger than the sum of its proper divisors (1).

13603861 is an equidigital number, since it uses as much as digits as its factorization.

13603861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 13603861 is about 3688.3412260798. The cubic root of 13603861 is about 238.7192246727.

The spelling of 13603861 in words is "thirteen million, six hundred three thousand, eight hundred sixty-one".