131128539 has 4 divisors (see below), whose sum is σ = 174838056. Its totient is φ = 87419024.

The previous prime is 131128507. The next prime is 131128541. The reversal of 131128539 is 935821131.

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

It is a cyclic number.

It is not a de Polignac number, because 131128539 - 2⁵ = 131128507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131128559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21854754 + ... + 21854759.

It is an arithmetic number, because the mean of its divisors is an integer number (43709514).

Almost surely, 2^131128539 is an apocalyptic number.

131128539 is a deficient number, since it is larger than the sum of its proper divisors (43709517).

131128539 is an equidigital number, since it uses as much as digits as its factorization.

131128539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43709516.

The product of its digits is 6480, while the sum is 33.

The square root of 131128539 is about 11451.1370177812. The cubic root of 131128539 is about 508.0413649228.

The spelling of 131128539 in words is "one hundred thirty-one million, one hundred twenty-eight thousand, five hundred thirty-nine".