128981417 has 2 divisors, whose sum is σ = 128981418. Its totient is φ = 128981416.

The previous prime is 128981407. The next prime is 128981423. The reversal of 128981417 is 714189821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68079001 + 60902416 = 8251^2 + 7804^2 .

It is an emirp because it is prime and its reverse (714189821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128981417 - 2¹⁴ = 128965033 is a prime.

It is not a weakly prime, because it can be changed into another prime (128981407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64490708 + 64490709.

It is an arithmetic number, because the mean of its divisors is an integer number (64490709).

Almost surely, 2^128981417 is an apocalyptic number.

It is an amenable number.

128981417 is a deficient number, since it is larger than the sum of its proper divisors (1).

128981417 is an equidigital number, since it uses as much as digits as its factorization.

128981417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 41.

The square root of 128981417 is about 11356.9985911772. The cubic root of 128981417 is about 505.2531710995.

The spelling of 128981417 in words is "one hundred twenty-eight million, nine hundred eighty-one thousand, four hundred seventeen".