1231123231001 has 4 divisors (see below), whose sum is σ = 1231262145792. Its totient is φ = 1230984316212.

The previous prime is 1231123230917. The next prime is 1231123231033. The reversal of 1231123231001 is 1001323211321.

It is a happy number.

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 1231123231001 - 2¹⁸ = 1231122968857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231123234001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69444101 + ... + 69461826.

It is an arithmetic number, because the mean of its divisors is an integer number (307815536448).

Almost surely, 2^{1231123231001} is an apocalyptic number.

It is an amenable number.

1231123231001 is a deficient number, since it is larger than the sum of its proper divisors (138914791).

1231123231001 is an equidigital number, since it uses as much as digits as its factorization.

1231123231001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138914790.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1231123231001 its reverse (1001323211321), we get a palindrome (2232446442322).

The spelling of 1231123231001 in words is "one trillion, two hundred thirty-one billion, one hundred twenty-three million, two hundred thirty-one thousand, one".