12403531909 has 2 divisors, whose sum is σ = 12403531910. Its totient is φ = 12403531908.

The previous prime is 12403531883. The next prime is 12403531957. The reversal of 12403531909 is 90913530421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12202516225 + 201015684 = 110465^2 + 14178^2 .

It is a cyclic number.

It is not a de Polignac number, because 12403531909 - 2²⁹ = 11866660997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12403531979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6201765954 + 6201765955.

It is an arithmetic number, because the mean of its divisors is an integer number (6201765955).

Almost surely, 2^12403531909 is an apocalyptic number.

It is an amenable number.

12403531909 is a deficient number, since it is larger than the sum of its proper divisors (1).

12403531909 is an equidigital number, since it uses as much as digits as its factorization.

12403531909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 37.

The spelling of 12403531909 in words is "twelve billion, four hundred three million, five hundred thirty-one thousand, nine hundred nine".