1231122423 has 32 divisors (see below), whose sum is σ = 1781245440. Its totient is φ = 753701760.

The previous prime is 1231122421. The next prime is 1231122433. The reversal of 1231122423 is 3242211321.

It is not a de Polignac number, because 1231122423 - 2¹ = 1231122421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1231122423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231122421) 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 31 ways as a sum of consecutive naturals, for example, 654961 + ... + 656837.

It is an arithmetic number, because the mean of its divisors is an integer number (55663920).

Almost surely, 2^1231122423 is an apocalyptic number.

1231122423 is a deficient number, since it is larger than the sum of its proper divisors (550123017).

1231122423 is a wasteful number, since it uses less digits than its factorization.

1231122423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2247.

The product of its digits is 576, while the sum is 21.

The square root of 1231122423 is about 35087.3541749731. The cubic root of 1231122423 is about 1071.7670812626.

Adding to 1231122423 its reverse (3242211321), we get a palindrome (4473333744).

The spelling of 1231122423 in words is "one billion, two hundred thirty-one million, one hundred twenty-two thousand, four hundred twenty-three".