131321106561 has 8 divisors (see below), whose sum is σ = 175367970144. Its totient is φ = 87410823680.

The previous prime is 131321106529. The next prime is 131321106569. The reversal of 131321106561 is 165601123131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131321106561 - 2⁵ = 131321106529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131321106569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34142931 + ... + 34146776.

It is an arithmetic number, because the mean of its divisors is an integer number (21920996268).

Almost surely, 2^131321106561 is an apocalyptic number.

It is an amenable number.

131321106561 is a deficient number, since it is larger than the sum of its proper divisors (44046863583).

131321106561 is an equidigital number, since it uses as much as digits as its factorization.

131321106561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68290351.

The product of its (nonzero) digits is 3240, while the sum is 30.

Adding to 131321106561 its reverse (165601123131), we get a palindrome (296922229692).

The spelling of 131321106561 in words is "one hundred thirty-one billion, three hundred twenty-one million, one hundred six thousand, five hundred sixty-one".