128016569 has 2 divisors, whose sum is σ = 128016570. Its totient is φ = 128016568.

The previous prime is 128016541. The next prime is 128016587. The reversal of 128016569 is 965610821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127961344 + 55225 = 11312^2 + 235^2 .

It is a cyclic number.

It is not a de Polignac number, because 128016569 - 2¹² = 128012473 is a prime.

It is a super-2 number, since 2×128016569² = 32776483877063522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (128016599) 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, 64008284 + 64008285.

It is an arithmetic number, because the mean of its divisors is an integer number (64008285).

Almost surely, 2^128016569 is an apocalyptic number.

It is an amenable number.

128016569 is a deficient number, since it is larger than the sum of its proper divisors (1).

128016569 is an equidigital number, since it uses as much as digits as its factorization.

128016569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 128016569 is about 11314.4407285557. The cubic root of 128016569 is about 503.9901644696.

The spelling of 128016569 in words is "one hundred twenty-eight million, sixteen thousand, five hundred sixty-nine".