12031331209 has 2 divisors, whose sum is σ = 12031331210. Its totient is φ = 12031331208.

The previous prime is 12031331173. The next prime is 12031331281. The reversal of 12031331209 is 90213313021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7754563600 + 4276767609 = 88060^2 + 65397^2 .

It is a cyclic number.

It is not a de Polignac number, because 12031331209 - 2⁹ = 12031330697 is a prime.

It is not a weakly prime, because it can be changed into another prime (12031331009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6015665604 + 6015665605.

It is an arithmetic number, because the mean of its divisors is an integer number (6015665605).

Almost surely, 2^12031331209 is an apocalyptic number.

It is an amenable number.

12031331209 is a deficient number, since it is larger than the sum of its proper divisors (1).

12031331209 is an equidigital number, since it uses as much as digits as its factorization.

12031331209 is an evil number, because the sum of its binary digits is even.

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

The spelling of 12031331209 in words is "twelve billion, thirty-one million, three hundred thirty-one thousand, two hundred nine".