1313111531 has 4 divisors (see below), whose sum is σ = 1314181200. Its totient is φ = 1312041864.

The previous prime is 1313111519. The next prime is 1313111539. The reversal of 1313111531 is 1351113131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1351113131 = 17 ⋅79477243.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1313111531 is a prime.

It is a super-2 number, since 2×1313111531² = 3448523785690327922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1313111539) 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, 532991 + ... + 535448.

It is an arithmetic number, because the mean of its divisors is an integer number (328545300).

Almost surely, 2^1313111531 is an apocalyptic number.

1313111531 is a deficient number, since it is larger than the sum of its proper divisors (1069669).

1313111531 is a wasteful number, since it uses less digits than its factorization.

1313111531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069668.

The product of its digits is 135, while the sum is 20.

The square root of 1313111531 is about 36236.8808122333. The cubic root of 1313111531 is about 1095.0498037577.

Adding to 1313111531 its reverse (1351113131), we get a palindrome (2664224662).

The spelling of 1313111531 in words is "one billion, three hundred thirteen million, one hundred eleven thousand, five hundred thirty-one".