1312520331 has 16 divisors (see below), whose sum is σ = 1799729568. Its totient is φ = 850329600.

The previous prime is 1312520311. The next prime is 1312520359. The reversal of 1312520331 is 1330252131.

It is not a de Polignac number, because 1312520331 - 2¹⁸ = 1312258187 is a prime.

It is a super-2 number, since 2×1312520331² = 3445419238576699122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1312520298 and 1312520307.

It is not an unprimeable number, because it can be changed into a prime (1312520311) 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 15 ways as a sum of consecutive naturals, for example, 10851 + ... + 52371.

It is an arithmetic number, because the mean of its divisors is an integer number (112483098).

Almost surely, 2^1312520331 is an apocalyptic number.

1312520331 is a deficient number, since it is larger than the sum of its proper divisors (487209237).

1312520331 is a wasteful number, since it uses less digits than its factorization.

1312520331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41822.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 1312520331 is about 36228.7224588447. The cubic root of 1312520331 is about 1094.8854382763.

Adding to 1312520331 its reverse (1330252131), we get a palindrome (2642772462).

The spelling of 1312520331 in words is "one billion, three hundred twelve million, five hundred twenty thousand, three hundred thirty-one".