1315321131 has 4 divisors (see below), whose sum is σ = 1753761512. Its totient is φ = 876880752.

The previous prime is 1315321099. The next prime is 1315321141. The reversal of 1315321131 is 1311235131.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1315321131 - 2⁵ = 1315321099 is a prime.

It is a super-2 number, since 2×1315321131² = 3460139355310238322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1315321098 and 1315321107.

It is not an unprimeable number, because it can be changed into a prime (1315321141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219220186 + ... + 219220191.

It is an arithmetic number, because the mean of its divisors is an integer number (438440378).

Almost surely, 2^1315321131 is an apocalyptic number.

1315321131 is a deficient number, since it is larger than the sum of its proper divisors (438440381).

1315321131 is an equidigital number, since it uses as much as digits as its factorization.

1315321131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438440380.

The product of its digits is 270, while the sum is 21.

The square root of 1315321131 is about 36267.3562725490. The cubic root of 1315321131 is about 1095.6636805620.

Adding to 1315321131 its reverse (1311235131), we get a palindrome (2626556262).

The spelling of 1315321131 in words is "one billion, three hundred fifteen million, three hundred twenty-one thousand, one hundred thirty-one".