131221440206617 has 8 divisors (see below), whose sum is σ = 134015493974400. Its totient is φ = 128427474281904.

The previous prime is 131221440206581. The next prime is 131221440206627. The reversal of 131221440206617 is 716602044122131.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131221440206617 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131221440206617.

It is not an unprimeable number, because it can be changed into a prime (131221440206627) 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, 18936942 + ... + 24920887.

It is an arithmetic number, because the mean of its divisors is an integer number (16751936746800).

Almost surely, 2^{131221440206617} is an apocalyptic number.

It is an amenable number.

131221440206617 is a deficient number, since it is larger than the sum of its proper divisors (2794053767783).

131221440206617 is an equidigital number, since it uses as much as digits as its factorization.

131221440206617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43921535.

The product of its (nonzero) digits is 96768, while the sum is 40.

Adding to 131221440206617 its reverse (716602044122131), we get a palindrome (847823484328748).

The spelling of 131221440206617 in words is "one hundred thirty-one trillion, two hundred twenty-one billion, four hundred forty million, two hundred six thousand, six hundred seventeen".