20003131609 has 2 divisors, whose sum is σ = 20003131610. Its totient is φ = 20003131608.

The previous prime is 20003131607. The next prime is 20003131613. The reversal of 20003131609 is 90613130002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15265838025 + 4737293584 = 123555^2 + 68828^2 .

It is a cyclic number.

It is not a de Polignac number, because 20003131609 - 2¹ = 20003131607 is a prime.

Together with 20003131607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20003131607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001565804 + 10001565805.

It is an arithmetic number, because the mean of its divisors is an integer number (10001565805).

Almost surely, 2^20003131609 is an apocalyptic number.

It is an amenable number.

20003131609 is a deficient number, since it is larger than the sum of its proper divisors (1).

20003131609 is an equidigital number, since it uses as much as digits as its factorization.

20003131609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 25.

The spelling of 20003131609 in words is "twenty billion, three million, one hundred thirty-one thousand, six hundred nine".