128462989 has 2 divisors, whose sum is σ = 128462990. Its totient is φ = 128462988.

The previous prime is 128462959. The next prime is 128462993. The reversal of 128462989 is 989264821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126112900 + 2350089 = 11230^2 + 1533^2 .

It is a cyclic number.

It is not a de Polignac number, because 128462989 - 2⁷ = 128462861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128462909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64231494 + 64231495.

It is an arithmetic number, because the mean of its divisors is an integer number (64231495).

Almost surely, 2^128462989 is an apocalyptic number.

It is an amenable number.

128462989 is a deficient number, since it is larger than the sum of its proper divisors (1).

128462989 is an equidigital number, since it uses as much as digits as its factorization.

128462989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 49.

The square root of 128462989 is about 11334.1514459619. The cubic root of 128462989 is about 504.5753237872.

The spelling of 128462989 in words is "one hundred twenty-eight million, four hundred sixty-two thousand, nine hundred eighty-nine".