128418469 has 2 divisors, whose sum is σ = 128418470. Its totient is φ = 128418468.

The previous prime is 128418449. The next prime is 128418487. The reversal of 128418469 is 964814821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110040100 + 18378369 = 10490^2 + 4287^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128418469 is a prime.

It is a super-2 number, since 2×128418469² = 32982606360607922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128418439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64209234 + 64209235.

It is an arithmetic number, because the mean of its divisors is an integer number (64209235).

Almost surely, 2^128418469 is an apocalyptic number.

It is an amenable number.

128418469 is a deficient number, since it is larger than the sum of its proper divisors (1).

128418469 is an equidigital number, since it uses as much as digits as its factorization.

128418469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 43.

The square root of 128418469 is about 11332.1872998993. The cubic root of 128418469 is about 504.5170286858.

The spelling of 128418469 in words is "one hundred twenty-eight million, four hundred eighteen thousand, four hundred sixty-nine".