83128889 has 2 divisors, whose sum is σ = 83128890. Its totient is φ = 83128888.

The previous prime is 83128883. The next prime is 83128891. The reversal of 83128889 is 98882138.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69438889 + 13690000 = 8333^2 + 3700^2 .

It is a cyclic number.

It is not a de Polignac number, because 83128889 - 2⁴ = 83128873 is a prime.

It is a Sophie Germain prime.

Together with 83128891, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (83128883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41564444 + 41564445.

It is an arithmetic number, because the mean of its divisors is an integer number (41564445).

Almost surely, 2^83128889 is an apocalyptic number.

It is an amenable number.

83128889 is a deficient number, since it is larger than the sum of its proper divisors (1).

83128889 is an equidigital number, since it uses as much as digits as its factorization.

83128889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 221184, while the sum is 47.

The square root of 83128889 is about 9117.5045379753. The cubic root of 83128889 is about 436.4327427102.

The spelling of 83128889 in words is "eighty-three million, one hundred twenty-eight thousand, eight hundred eighty-nine".