1231343442 has 72 divisors (see below), whose sum is σ = 3175760016. Its totient is φ = 343620144.

The previous prime is 1231343423. The next prime is 1231343483. The reversal of 1231343442 is 2443431321.

1231343442 is a `hidden beast` number, since 1 + 2 + 313 + 4 + 344 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 21693 + ... + 54159.

It is an arithmetic number, because the mean of its divisors is an integer number (44107778).

Almost surely, 2^1231343442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231343442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1587880008).

1231343442 is an abundant number, since it is smaller than the sum of its proper divisors (1944416574).

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

1231343442 is a wasteful number, since it uses less digits than its factorization.

1231343442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32532 (or 32522 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

The square root of 1231343442 is about 35090.5035871530. The cubic root of 1231343442 is about 1071.8312142603.

Adding to 1231343442 its reverse (2443431321), we get a palindrome (3674774763).

It can be divided in two parts, 12313 and 43442, that added together give a palindrome (55755).

The spelling of 1231343442 in words is "one billion, two hundred thirty-one million, three hundred forty-three thousand, four hundred forty-two".