131728539 has 12 divisors (see below), whose sum is σ = 185370216. Its totient is φ = 83196288.

The previous prime is 131728537. The next prime is 131728549. The reversal of 131728539 is 935827131.

It is not a de Polignac number, because 131728539 - 2¹ = 131728537 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 131728497 and 131728506.

It is not an unprimeable number, because it can be changed into a prime (131728537) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59734 + ... + 61899.

It is an arithmetic number, because the mean of its divisors is an integer number (15447518).

Almost surely, 2^131728539 is an apocalyptic number.

131728539 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

131728539 is a deficient number, since it is larger than the sum of its proper divisors (53641677).

131728539 is a wasteful number, since it uses less digits than its factorization.

131728539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121674 (or 121655 counting only the distinct ones).

The product of its digits is 45360, while the sum is 39.

The square root of 131728539 is about 11477.3053893325. The cubic root of 131728539 is about 508.8150614151.

The spelling of 131728539 in words is "one hundred thirty-one million, seven hundred twenty-eight thousand, five hundred thirty-nine".