1231043240409 has 8 divisors (see below), whose sum is σ = 1663875795552. Its totient is φ = 809453089440.

The previous prime is 1231043240387. The next prime is 1231043240411. The reversal of 1231043240409 is 9040423401321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1231043240409 - 2¹⁹ = 1231042716121 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231043240409.

It is not an unprimeable number, because it can be changed into a prime (1231043240429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2810600787 + ... + 2810601224.

It is an arithmetic number, because the mean of its divisors is an integer number (207984474444).

Almost surely, 2^{1231043240409} is an apocalyptic number.

It is an amenable number.

1231043240409 is a deficient number, since it is larger than the sum of its proper divisors (432832555143).

1231043240409 is an equidigital number, since it uses as much as digits as its factorization.

1231043240409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5621202087.

The product of its (nonzero) digits is 20736, while the sum is 33.

The spelling of 1231043240409 in words is "one trillion, two hundred thirty-one billion, forty-three million, two hundred forty thousand, four hundred nine".