128020969 has 2 divisors, whose sum is σ = 128020970. Its totient is φ = 128020968.

The previous prime is 128020957. The next prime is 128021011. The reversal of 128020969 is 969020821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94322944 + 33698025 = 9712^2 + 5805^2 .

It is a cyclic number.

It is not a de Polignac number, because 128020969 - 2⁹ = 128020457 is a prime.

It is a super-2 number, since 2×128020969² = 32778737007397922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128020909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64010484 + 64010485.

It is an arithmetic number, because the mean of its divisors is an integer number (64010485).

Almost surely, 2^128020969 is an apocalyptic number.

It is an amenable number.

128020969 is a deficient number, since it is larger than the sum of its proper divisors (1).

128020969 is an equidigital number, since it uses as much as digits as its factorization.

128020969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 128020969 is about 11314.6351686654. The cubic root of 128020969 is about 503.9959385433.

The spelling of 128020969 in words is "one hundred twenty-eight million, twenty thousand, nine hundred sixty-nine".