128132987 has 2 divisors, whose sum is σ = 128132988. Its totient is φ = 128132986.

The previous prime is 128132981. The next prime is 128133059. The reversal of 128132987 is 789231821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128132987 - 2⁸ = 128132731 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128132981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64066493 + 64066494.

It is an arithmetic number, because the mean of its divisors is an integer number (64066494).

Almost surely, 2^128132987 is an apocalyptic number.

128132987 is a deficient number, since it is larger than the sum of its proper divisors (1).

128132987 is an equidigital number, since it uses as much as digits as its factorization.

128132987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 41.

The square root of 128132987 is about 11319.5842238132. The cubic root of 128132987 is about 504.1428940487.

The spelling of 128132987 in words is "one hundred twenty-eight million, one hundred thirty-two thousand, nine hundred eighty-seven".