128316919 has 4 divisors (see below), whose sum is σ = 128414944. Its totient is φ = 128218896.

The previous prime is 128316913. The next prime is 128316941. The reversal of 128316919 is 919613821.

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 128316919 - 2⁵ = 128316887 is a prime.

It is a super-2 number, since 2×128316919² = 32930463403305122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128316913) 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, 47022 + ... + 49675.

It is an arithmetic number, because the mean of its divisors is an integer number (32103736).

Almost surely, 2^128316919 is an apocalyptic number.

128316919 is a deficient number, since it is larger than the sum of its proper divisors (98025).

128316919 is an equidigital number, since it uses as much as digits as its factorization.

128316919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98024.

The product of its digits is 23328, while the sum is 40.

The square root of 128316919 is about 11327.7058136235. The cubic root of 128316919 is about 504.3840072823.

The spelling of 128316919 in words is "one hundred twenty-eight million, three hundred sixteen thousand, nine hundred nineteen".