128391368919 has 32 divisors (see below), whose sum is σ = 188120509440. Its totient is φ = 77244451200.

The previous prime is 128391368899. The next prime is 128391368951. The reversal of 128391368919 is 919863193821.

It is not a de Polignac number, because 128391368919 - 2⁸ = 128391368663 is a prime.

It is a super-2 number, since 2×128391368919² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128391360919) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2451297 + ... + 2503125.

It is an arithmetic number, because the mean of its divisors is an integer number (5878765920).

Almost surely, 2^128391368919 is an apocalyptic number.

128391368919 is a deficient number, since it is larger than the sum of its proper divisors (59729140521).

128391368919 is a wasteful number, since it uses less digits than its factorization.

128391368919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52391.

The product of its digits is 5038848, while the sum is 60.

The spelling of 128391368919 in words is "one hundred twenty-eight billion, three hundred ninety-one million, three hundred sixty-eight thousand, nine hundred nineteen".