128641019 has 4 divisors (see below), whose sum is σ = 138536496. Its totient is φ = 118745544.

The previous prime is 128640997. The next prime is 128641027. The reversal of 128641019 is 910146821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 910146821 = 977 ⋅931573.

It is a cyclic number.

It is not a de Polignac number, because 128641019 - 2¹² = 128636923 is a prime.

It is a super-2 number, since 2×128641019² = 33097023538716722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128641049) 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, 4947719 + ... + 4947744.

It is an arithmetic number, because the mean of its divisors is an integer number (34634124).

Almost surely, 2^128641019 is an apocalyptic number.

128641019 is a deficient number, since it is larger than the sum of its proper divisors (9895477).

128641019 is an equidigital number, since it uses as much as digits as its factorization.

128641019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9895476.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 128641019 is about 11342.0024246162. The cubic root of 128641019 is about 504.8083041988.

The spelling of 128641019 in words is "one hundred twenty-eight million, six hundred forty-one thousand, nineteen".