13405740209 has 2 divisors, whose sum is σ = 13405740210. Its totient is φ = 13405740208.

The previous prime is 13405740199. The next prime is 13405740247. The reversal of 13405740209 is 90204750431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11594982400 + 1810757809 = 107680^2 + 42553^2 .

It is a cyclic number.

It is not a de Polignac number, because 13405740209 - 2⁸ = 13405739953 is a prime.

It is not a weakly prime, because it can be changed into another prime (13405740259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6702870104 + 6702870105.

It is an arithmetic number, because the mean of its divisors is an integer number (6702870105).

Almost surely, 2^13405740209 is an apocalyptic number.

It is an amenable number.

13405740209 is a deficient number, since it is larger than the sum of its proper divisors (1).

13405740209 is an equidigital number, since it uses as much as digits as its factorization.

13405740209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 13405740209 in words is "thirteen billion, four hundred five million, seven hundred forty thousand, two hundred nine".