128771983 has 2 divisors, whose sum is σ = 128771984. Its totient is φ = 128771982.

The previous prime is 128771969. The next prime is 128772001. The reversal of 128771983 is 389177821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128771983 - 2²¹ = 126674831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128772983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64385991 + 64385992.

It is an arithmetic number, because the mean of its divisors is an integer number (64385992).

Almost surely, 2^128771983 is an apocalyptic number.

128771983 is a deficient number, since it is larger than the sum of its proper divisors (1).

128771983 is an equidigital number, since it uses as much as digits as its factorization.

128771983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 46.

The square root of 128771983 is about 11347.7743632838. The cubic root of 128771983 is about 504.9795541178.

The spelling of 128771983 in words is "one hundred twenty-eight million, seven hundred seventy-one thousand, nine hundred eighty-three".