1231000231309 has 4 divisors (see below), whose sum is σ = 1236834355840. Its totient is φ = 1225166106780.

The previous prime is 1231000231303. The next prime is 1231000231319. The reversal of 1231000231309 is 9031320001321.

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 a cyclic number.

It is not a de Polignac number, because 1231000231309 - 2¹⁵ = 1231000198541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231000231303) 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 3 ways as a sum of consecutive naturals, for example, 2917061949 + ... + 2917062370.

It is an arithmetic number, because the mean of its divisors is an integer number (309208588960).

Almost surely, 2^{1231000231309} is an apocalyptic number.

It is an amenable number.

1231000231309 is a deficient number, since it is larger than the sum of its proper divisors (5834124531).

1231000231309 is an equidigital number, since it uses as much as digits as its factorization.

1231000231309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5834124530.

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

The spelling of 1231000231309 in words is "one trillion, two hundred thirty-one billion, two hundred thirty-one thousand, three hundred nine".