1313121312131 has 4 divisors (see below), whose sum is σ = 1314709125912. Its totient is φ = 1311533498352.

The previous prime is 1313121312127. The next prime is 1313121312137. The reversal of 1313121312131 is 1312131213131.

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

It is a cyclic number.

It is not a de Polignac number, because 1313121312131 - 2² = 1313121312127 is a prime.

It is a super-2 number, since 2×1313121312131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1313121312097 and 1313121312106.

It is not an unprimeable number, because it can be changed into a prime (1313121312137) 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, 793905650 + ... + 793907303.

It is an arithmetic number, because the mean of its divisors is an integer number (328677281478).

Almost surely, 2^{1313121312131} is an apocalyptic number.

1313121312131 is a deficient number, since it is larger than the sum of its proper divisors (1587813781).

1313121312131 is an equidigital number, since it uses as much as digits as its factorization.

1313121312131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1587813780.

The product of its digits is 324, while the sum is 23.

Adding to 1313121312131 its reverse (1312131213131), we get a palindrome (2625252525262).

The spelling of 1313121312131 in words is "one trillion, three hundred thirteen billion, one hundred twenty-one million, three hundred twelve thousand, one hundred thirty-one".