131728416491 has 4 divisors (see below), whose sum is σ = 150546761712. Its totient is φ = 112910071272.

The previous prime is 131728416437. The next prime is 131728416493. The reversal of 131728416491 is 194614827131.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131728416491 is a prime.

It is a super-2 number, since 2×131728416491² (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 (131728416493) 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, 9409172600 + ... + 9409172613.

It is an arithmetic number, because the mean of its divisors is an integer number (37636690428).

Almost surely, 2^131728416491 is an apocalyptic number.

131728416491 is a deficient number, since it is larger than the sum of its proper divisors (18818345221).

131728416491 is an equidigital number, since it uses as much as digits as its factorization.

131728416491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18818345220.

The product of its digits is 290304, while the sum is 47.

The spelling of 131728416491 in words is "one hundred thirty-one billion, seven hundred twenty-eight million, four hundred sixteen thousand, four hundred ninety-one".