13888890409 has 2 divisors, whose sum is σ = 13888890410. Its totient is φ = 13888890408.

The previous prime is 13888890391. The next prime is 13888890439. The reversal of 13888890409 is 90409888831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12314784784 + 1574105625 = 110972^2 + 39675^2 .

It is a cyclic number.

It is not a de Polignac number, because 13888890409 - 2⁹ = 13888889897 is a prime.

It is not a weakly prime, because it can be changed into another prime (13888890439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6944445204 + 6944445205.

It is an arithmetic number, because the mean of its divisors is an integer number (6944445205).

Almost surely, 2^13888890409 is an apocalyptic number.

It is an amenable number.

13888890409 is a deficient number, since it is larger than the sum of its proper divisors (1).

13888890409 is an equidigital number, since it uses as much as digits as its factorization.

13888890409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3981312, while the sum is 58.

The spelling of 13888890409 in words is "thirteen billion, eight hundred eighty-eight million, eight hundred ninety thousand, four hundred nine".