131355656321 has 4 divisors (see below), whose sum is σ = 139082459652. Its totient is φ = 123628852992.

The previous prime is 131355656303. The next prime is 131355656417. The reversal of 131355656321 is 123656553131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 98897670400 + 32457985921 = 314480^2 + 180161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131355656321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131355656021) 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, 3863401640 + ... + 3863401673.

It is an arithmetic number, because the mean of its divisors is an integer number (34770614913).

Almost surely, 2^131355656321 is an apocalyptic number.

It is an amenable number.

131355656321 is a deficient number, since it is larger than the sum of its proper divisors (7726803331).

131355656321 is an equidigital number, since it uses as much as digits as its factorization.

131355656321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7726803330.

The product of its digits is 243000, while the sum is 41.

The spelling of 131355656321 in words is "one hundred thirty-one billion, three hundred fifty-five million, six hundred fifty-six thousand, three hundred twenty-one".