131391220605 has 16 divisors (see below), whose sum is σ = 217475124480. Its totient is φ = 67658927168.

The previous prime is 131391220603. The next prime is 131391220613. The reversal of 131391220605 is 506022193131.

It is a cyclic number.

It is not a de Polignac number, because 131391220605 - 2¹ = 131391220603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131391220603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151023957 + ... + 151024826.

It is an arithmetic number, because the mean of its divisors is an integer number (13592195280).

Almost surely, 2^131391220605 is an apocalyptic number.

131391220605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131391220605 is a deficient number, since it is larger than the sum of its proper divisors (86083903875).

131391220605 is a wasteful number, since it uses less digits than its factorization.

131391220605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302048820.

The product of its (nonzero) digits is 9720, while the sum is 33.

The spelling of 131391220605 in words is "one hundred thirty-one billion, three hundred ninety-one million, two hundred twenty thousand, six hundred five".