131026356561 has 4 divisors (see below), whose sum is σ = 174701808752. Its totient is φ = 87350904372.

The previous prime is 131026356541. The next prime is 131026356569. The reversal of 131026356561 is 165653620131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 165653620131 = 3 ⋅55217873377.

It is a de Polignac number, because none of the positive numbers 2^k-131026356561 is a prime.

It is a super-2 number, since 2×131026356561² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131026356569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21837726091 + ... + 21837726096.

It is an arithmetic number, because the mean of its divisors is an integer number (43675452188).

Almost surely, 2^131026356561 is an apocalyptic number.

It is an amenable number.

131026356561 is a deficient number, since it is larger than the sum of its proper divisors (43675452191).

131026356561 is an equidigital number, since it uses as much as digits as its factorization.

131026356561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43675452190.

The product of its (nonzero) digits is 97200, while the sum is 39.

Adding to 131026356561 its reverse (165653620131), we get a palindrome (296679976692).

The spelling of 131026356561 in words is "one hundred thirty-one billion, twenty-six million, three hundred fifty-six thousand, five hundred sixty-one".