128521299 has 16 divisors (see below), whose sum is σ = 173165472. Its totient is φ = 84784128.

The previous prime is 128521273. The next prime is 128521303. The reversal of 128521299 is 992125821.

It is not a de Polignac number, because 128521299 - 2⁹ = 128520787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128521219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165877 + ... + 166649.

It is an arithmetic number, because the mean of its divisors is an integer number (10822842).

Almost surely, 2^128521299 is an apocalyptic number.

128521299 is a deficient number, since it is larger than the sum of its proper divisors (44644173).

128521299 is a wasteful number, since it uses less digits than its factorization.

128521299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286.

The product of its digits is 25920, while the sum is 39.

The square root of 128521299 is about 11336.7234684454. The cubic root of 128521299 is about 504.6516553359.

The spelling of 128521299 in words is "one hundred twenty-eight million, five hundred twenty-one thousand, two hundred ninety-nine".