1313123131 has 4 divisors (see below), whose sum is σ = 1322570200. Its totient is φ = 1303676064.

The previous prime is 1313123087. The next prime is 1313123159. The reversal of 1313123131 is 1313213131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1313213131 = 2683 ⋅489457.

It is a cyclic number.

It is not a de Polignac number, because 1313123131 - 2¹³ = 1313114939 is a prime.

It is a super-4 number, since 4×1313123131⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1313123099 and 1313123108.

It is not an unprimeable number, because it can be changed into a prime (1313123731) 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, 4723326 + ... + 4723603.

It is an arithmetic number, because the mean of its divisors is an integer number (330642550).

Almost surely, 2^1313123131 is an apocalyptic number.

1313123131 is a deficient number, since it is larger than the sum of its proper divisors (9447069).

1313123131 is an equidigital number, since it uses as much as digits as its factorization.

1313123131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9447068.

The product of its digits is 162, while the sum is 19.

The square root of 1313123131 is about 36237.0408698061. The cubic root of 1313123131 is about 1095.0530282973.

Adding to 1313123131 its reverse (1313213131), we get a palindrome (2626336262).

Subtracting 1313123131 from its reverse (1313213131), we obtain a square (90000 = 300²).

The spelling of 1313123131 in words is "one billion, three hundred thirteen million, one hundred twenty-three thousand, one hundred thirty-one".