1231343409 has 4 divisors (see below), whose sum is σ = 1641791216. Its totient is φ = 820895604.

The previous prime is 1231343369. The next prime is 1231343413. The reversal of 1231343409 is 9043431321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1231343409 - 2¹¹ = 1231341361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231343489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205223899 + ... + 205223904.

It is an arithmetic number, because the mean of its divisors is an integer number (410447804).

Almost surely, 2^1231343409 is an apocalyptic number.

It is an amenable number.

1231343409 is a deficient number, since it is larger than the sum of its proper divisors (410447807).

1231343409 is an equidigital number, since it uses as much as digits as its factorization.

1231343409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410447806.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 1231343409 is about 35090.5031169403. The cubic root of 1231343409 is about 1071.8312046852.

The spelling of 1231343409 in words is "one billion, two hundred thirty-one million, three hundred forty-three thousand, four hundred nine".