231241203209 has 2 divisors, whose sum is σ = 231241203210. Its totient is φ = 231241203208.

The previous prime is 231241203173. The next prime is 231241203229. The reversal of 231241203209 is 902302142132.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 229786009600 + 1455193609 = 479360^2 + 38147^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231241203209 is a prime.

It is not a weakly prime, because it can be changed into another prime (231241203229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115620601604 + 115620601605.

It is an arithmetic number, because the mean of its divisors is an integer number (115620601605).

Almost surely, 2^231241203209 is an apocalyptic number.

It is an amenable number.

231241203209 is a deficient number, since it is larger than the sum of its proper divisors (1).

231241203209 is an equidigital number, since it uses as much as digits as its factorization.

231241203209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 231241203209 in words is "two hundred thirty-one billion, two hundred forty-one million, two hundred three thousand, two hundred nine".