1231442453209 has 2 divisors, whose sum is σ = 1231442453210. Its totient is φ = 1231442453208.

The previous prime is 1231442453191. The next prime is 1231442453299. The reversal of 1231442453209 is 9023542441321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 977656225225 + 253786227984 = 988765^2 + 503772^2 .

It is an emirp because it is prime and its reverse (9023542441321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231442453209 - 2³³ = 1222852518617 is a prime.

It is not a weakly prime, because it can be changed into another prime (1231442453299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615721226604 + 615721226605.

It is an arithmetic number, because the mean of its divisors is an integer number (615721226605).

Almost surely, 2^{1231442453209} is an apocalyptic number.

It is an amenable number.

1231442453209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231442453209 is an equidigital number, since it uses as much as digits as its factorization.

1231442453209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 1231442453209 in words is "one trillion, two hundred thirty-one billion, four hundred forty-two million, four hundred fifty-three thousand, two hundred nine".