128300981 has 2 divisors, whose sum is σ = 128300982. Its totient is φ = 128300980.

The previous prime is 128300951. The next prime is 128300999. The reversal of 128300981 is 189003821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125238481 + 3062500 = 11191^2 + 1750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128300981 is a prime.

It is a super-2 number, since 2×128300981² = 32922283451124722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128300951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64150490 + 64150491.

It is an arithmetic number, because the mean of its divisors is an integer number (64150491).

Almost surely, 2^128300981 is an apocalyptic number.

It is an amenable number.

128300981 is a deficient number, since it is larger than the sum of its proper divisors (1).

128300981 is an equidigital number, since it uses as much as digits as its factorization.

128300981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 128300981 is about 11327.0022954001. The cubic root of 128300981 is about 504.3631235588.

The spelling of 128300981 in words is "one hundred twenty-eight million, three hundred thousand, nine hundred eighty-one".