1231444109989 has 4 divisors (see below), whose sum is σ = 1231994601324. Its totient is φ = 1230893618656.

The previous prime is 1231444109983. The next prime is 1231444110023. The reversal of 1231444109989 is 9899014441321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 712420402500 + 519023707489 = 844050^2 + 720433^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231444109989 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 (1231444109983) 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, 275242312 + ... + 275246785.

It is an arithmetic number, because the mean of its divisors is an integer number (307998650331).

Almost surely, 2^{1231444109989} is an apocalyptic number.

It is an amenable number.

1231444109989 is a deficient number, since it is larger than the sum of its proper divisors (550491335).

1231444109989 is an equidigital number, since it uses as much as digits as its factorization.

1231444109989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550491334.

The product of its (nonzero) digits is 2239488, while the sum is 55.

The spelling of 1231444109989 in words is "one trillion, two hundred thirty-one billion, four hundred forty-four million, one hundred nine thousand, nine hundred eighty-nine".