1231031424 has 128 divisors (see below), whose sum is σ = 3808010880. Its totient is φ = 345047040.

The previous prime is 1231031381. The next prime is 1231031429. The reversal of 1231031424 is 4241301321.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 1231031424.

It is not an unprimeable number, because it can be changed into a prime (1231031429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138144 + ... + 146784.

It is an arithmetic number, because the mean of its divisors is an integer number (29750085).

Almost surely, 2^1231031424 is an apocalyptic number.

1231031424 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231031424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1904005440).

1231031424 is an abundant number, since it is smaller than the sum of its proper divisors (2576979456).

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

1231031424 is an equidigital number, since it uses as much as digits as its factorization.

1231031424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8718 (or 8706 counting only the distinct ones).

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

The square root of 1231031424 is about 35086.0574017657. The cubic root of 1231031424 is about 1071.7406738872.

Adding to 1231031424 its reverse (4241301321), we get a palindrome (5472332745).

It can be divided in two parts, 12310 and 31424, that added together give a palindrome (43734).

The spelling of 1231031424 in words is "one billion, two hundred thirty-one million, thirty-one thousand, four hundred twenty-four".