13126356313531 has 4 divisors (see below), whose sum is σ = 13126989937392. Its totient is φ = 13125722689672.

The previous prime is 13126356313507. The next prime is 13126356313549. The reversal of 13126356313531 is 13531365362131.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13126356313531 is a prime.

It is a super-2 number, since 2×13126356313531² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13126356314531) 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, 316780855 + ... + 316822288.

It is an arithmetic number, because the mean of its divisors is an integer number (3281747484348).

Almost surely, 2^{13126356313531} is an apocalyptic number.

13126356313531 is a deficient number, since it is larger than the sum of its proper divisors (633623861).

13126356313531 is an equidigital number, since it uses as much as digits as its factorization.

13126356313531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633623860.

The product of its digits is 437400, while the sum is 43.

The spelling of 13126356313531 in words is "thirteen trillion, one hundred twenty-six billion, three hundred fifty-six million, three hundred thirteen thousand, five hundred thirty-one".