1231512313 has 8 divisors (see below), whose sum is σ = 1246293000. Its totient is φ = 1216752768.

The previous prime is 1231512287. The next prime is 1231512323. The reversal of 1231512313 is 3132151321.

It can be written as a sum of positive squares in 4 ways, for example, as 344569 + 1231167744 = 587^2 + 35088^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231512313 - 2⁵ = 1231512281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231512323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133395 + ... + 142327.

It is an arithmetic number, because the mean of its divisors is an integer number (155786625).

Almost surely, 2^1231512313 is an apocalyptic number.

It is an amenable number.

1231512313 is a deficient number, since it is larger than the sum of its proper divisors (14780687).

1231512313 is an equidigital number, since it uses as much as digits as its factorization.

1231512313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10571.

The product of its digits is 540, while the sum is 22.

The square root of 1231512313 is about 35092.9097254702. The cubic root of 1231512313 is about 1071.8802103213.

Adding to 1231512313 its reverse (3132151321), we get a palindrome (4363663634).

The spelling of 1231512313 in words is "one billion, two hundred thirty-one million, five hundred twelve thousand, three hundred thirteen".