1312311042 has 72 divisors (see below), whose sum is σ = 3397037436. Its totient is φ = 364803264.

The previous prime is 1312311029. The next prime is 1312311043. The reversal of 1312311042 is 2401132131.

1312311042 is a `hidden beast` number, since 1 + 312 + 311 + 0 + 42 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1261031121 + 51279921 = 35511^2 + 7161^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1312311043) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 12528 + ... + 52740.

Almost surely, 2^1312311042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1312311042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1698518718).

1312311042 is an abundant number, since it is smaller than the sum of its proper divisors (2084726394).

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

1312311042 is a wasteful number, since it uses less digits than its factorization.

1312311042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40272 (or 40262 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1312311042 is about 36225.8339034452. The cubic root of 1312311042 is about 1094.8272398993.

Adding to 1312311042 its reverse (2401132131), we get a palindrome (3713443173).

The spelling of 1312311042 in words is "one billion, three hundred twelve million, three hundred eleven thousand, forty-two".