128745769 has 2 divisors, whose sum is σ = 128745770. Its totient is φ = 128745768.

The previous prime is 128745733. The next prime is 128745787. The reversal of 128745769 is 967547821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72675625 + 56070144 = 8525^2 + 7488^2 .

It is a cyclic number.

It is not a de Polignac number, because 128745769 - 2¹¹ = 128743721 is a prime.

It is a super-2 number, since 2×128745769² = 33150946070802722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128745719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64372884 + 64372885.

It is an arithmetic number, because the mean of its divisors is an integer number (64372885).

Almost surely, 2^128745769 is an apocalyptic number.

It is an amenable number.

128745769 is a deficient number, since it is larger than the sum of its proper divisors (1).

128745769 is an equidigital number, since it uses as much as digits as its factorization.

128745769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 49.

The square root of 128745769 is about 11346.6192762426. The cubic root of 128745769 is about 504.9452857103.

The spelling of 128745769 in words is "one hundred twenty-eight million, seven hundred forty-five thousand, seven hundred sixty-nine".