1231512144 has 80 divisors (see below), whose sum is σ = 3380200320. Its totient is φ = 385620480.

The previous prime is 1231512137. The next prime is 1231512167. The reversal of 1231512144 is 4412151321.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39549 + ... + 63459.

It is an arithmetic number, because the mean of its divisors is an integer number (42252504).

Almost surely, 2^1231512144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231512144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1690100160).

1231512144 is an abundant number, since it is smaller than the sum of its proper divisors (2148688176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231512144 is a wasteful number, since it uses less digits than its factorization.

1231512144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23988 (or 23982 counting only the distinct ones).

The product of its digits is 960, while the sum is 24.

The square root of 1231512144 is about 35092.9073175763. The cubic root of 1231512144 is about 1071.8801612900.

Adding to 1231512144 its reverse (4412151321), we get a palindrome (5643663465).

The spelling of 1231512144 in words is "one billion, two hundred thirty-one million, five hundred twelve thousand, one hundred forty-four".