1312031538 has 48 divisors (see below), whose sum is σ = 2939030016. Its totient is φ = 422573760.

The previous prime is 1312031531. The next prime is 1312031579. The reversal of 1312031538 is 8351302131.

1312031538 is a `hidden beast` number, since 1 + 3 + 120 + 3 + 1 + 538 = 666.

It is not an unprimeable number, because it can be changed into a prime (1312031531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 457806 + ... + 460662.

It is an arithmetic number, because the mean of its divisors is an integer number (61229792).

Almost surely, 2^1312031538 is an apocalyptic number.

1312031538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1312031538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1469515008).

1312031538 is an abundant number, since it is smaller than the sum of its proper divisors (1626998478).

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

1312031538 is a wasteful number, since it uses less digits than its factorization.

1312031538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3719 (or 3716 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1312031538 is about 36221.9758986171. The cubic root of 1312031538 is about 1094.7495067220.

Adding to 1312031538 its reverse (8351302131), we get a palindrome (9663333669).

The spelling of 1312031538 in words is "one billion, three hundred twelve million, thirty-one thousand, five hundred thirty-eight".