128569019 has 4 divisors (see below), whose sum is σ = 128709840. Its totient is φ = 128428200.

The previous prime is 128569013. The next prime is 128569037. The reversal of 128569019 is 910965821.

It is a happy number.

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 128569019 - 2¹² = 128564923 is a prime.

It is a super-2 number, since 2×128569019² = 33059985293244722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128569013) 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, 69032 + ... + 70869.

It is an arithmetic number, because the mean of its divisors is an integer number (32177460).

Almost surely, 2^128569019 is an apocalyptic number.

128569019 is a deficient number, since it is larger than the sum of its proper divisors (140821).

128569019 is an equidigital number, since it uses as much as digits as its factorization.

128569019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140820.

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 128569019 is about 11338.8279376662. The cubic root of 128569019 is about 504.7141067149.

The spelling of 128569019 in words is "one hundred twenty-eight million, five hundred sixty-nine thousand, nineteen".