11405421409 has 2 divisors, whose sum is σ = 11405421410. Its totient is φ = 11405421408.

The previous prime is 11405421383. The next prime is 11405421413. The reversal of 11405421409 is 90412450411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11120757025 + 284664384 = 105455^2 + 16872^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11405421409 is a prime.

It is not a weakly prime, because it can be changed into another prime (11405421439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5702710704 + 5702710705.

It is an arithmetic number, because the mean of its divisors is an integer number (5702710705).

Almost surely, 2^11405421409 is an apocalyptic number.

It is an amenable number.

11405421409 is a deficient number, since it is larger than the sum of its proper divisors (1).

11405421409 is an equidigital number, since it uses as much as digits as its factorization.

11405421409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 31.

The spelling of 11405421409 in words is "eleven billion, four hundred five million, four hundred twenty-one thousand, four hundred nine".