128365619 has 2 divisors, whose sum is σ = 128365620. Its totient is φ = 128365618.

The previous prime is 128365591. The next prime is 128365639. The reversal of 128365619 is 916563821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128365619 is a prime.

It is a super-2 number, since 2×128365619² = 32955464282506322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128365639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64182809 + 64182810.

It is an arithmetic number, because the mean of its divisors is an integer number (64182810).

Almost surely, 2^128365619 is an apocalyptic number.

128365619 is a deficient number, since it is larger than the sum of its proper divisors (1).

128365619 is an equidigital number, since it uses as much as digits as its factorization.

128365619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 41.

The square root of 128365619 is about 11329.8552064887. The cubic root of 128365619 is about 504.4478086746.

The spelling of 128365619 in words is "one hundred twenty-eight million, three hundred sixty-five thousand, six hundred nineteen".