13355561 has 2 divisors, whose sum is σ = 13355562. Its totient is φ = 13355560.

The previous prime is 13355549. The next prime is 13355599. The reversal of 13355561 is 16555331.

13355561 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., 10272025 + 3083536 = 3205^2 + 1756^2 .

It is a cyclic number.

It is not a de Polignac number, because 13355561 - 2¹⁴ = 13339177 is a prime.

It is not a weakly prime, because it can be changed into another prime (13355501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6677780 + 6677781.

It is an arithmetic number, because the mean of its divisors is an integer number (6677781).

Almost surely, 2^13355561 is an apocalyptic number.

It is an amenable number.

13355561 is a deficient number, since it is larger than the sum of its proper divisors (1).

13355561 is an equidigital number, since it uses as much as digits as its factorization.

13355561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6750, while the sum is 29.

The square root of 13355561 is about 3654.5260978682. The cubic root of 13355561 is about 237.2579162087.

The spelling of 13355561 in words is "thirteen million, three hundred fifty-five thousand, five hundred sixty-one".