128131539 has 8 divisors (see below), whose sum is σ = 173737920. Its totient is φ = 83973096.

The previous prime is 128131517. The next prime is 128131547. The reversal of 128131539 is 935131821.

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

It is not a de Polignac number, because 128131539 - 2¹² = 128127443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128131589) 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, 361777 + ... + 362130.

It is an arithmetic number, because the mean of its divisors is an integer number (21717240).

Almost surely, 2^128131539 is an apocalyptic number.

128131539 is a deficient number, since it is larger than the sum of its proper divisors (45606381).

128131539 is an equidigital number, since it uses as much as digits as its factorization.

128131539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723969.

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

The square root of 128131539 is about 11319.5202636861. The cubic root of 128131539 is about 504.1409949757.

The spelling of 128131539 in words is "one hundred twenty-eight million, one hundred thirty-one thousand, five hundred thirty-nine".