128784919 has 2 divisors, whose sum is σ = 128784920. Its totient is φ = 128784918.

The previous prime is 128784893. The next prime is 128784923. The reversal of 128784919 is 919487821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128784919 - 2⁹ = 128784407 is a prime.

It is a super-2 number, since 2×128784919² = 33171110723673122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128784949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64392459 + 64392460.

It is an arithmetic number, because the mean of its divisors is an integer number (64392460).

Almost surely, 2^128784919 is an apocalyptic number.

128784919 is a deficient number, since it is larger than the sum of its proper divisors (1).

128784919 is an equidigital number, since it uses as much as digits as its factorization.

128784919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 49.

The square root of 128784919 is about 11348.3443285794. The cubic root of 128784919 is about 504.9964630671.

The spelling of 128784919 in words is "one hundred twenty-eight million, seven hundred eighty-four thousand, nine hundred nineteen".