128724469 has 2 divisors, whose sum is σ = 128724470. Its totient is φ = 128724468.

The previous prime is 128724437. The next prime is 128724473. The reversal of 128724469 is 964427821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120670225 + 8054244 = 10985^2 + 2838^2 .

It is a cyclic number.

It is not a de Polignac number, because 128724469 - 2⁵ = 128724437 is a prime.

It is a super-2 number, since 2×128724469² = 33139977838663922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128722469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64362234 + 64362235.

It is an arithmetic number, because the mean of its divisors is an integer number (64362235).

Almost surely, 2^128724469 is an apocalyptic number.

It is an amenable number.

128724469 is a deficient number, since it is larger than the sum of its proper divisors (1).

128724469 is an equidigital number, since it uses as much as digits as its factorization.

128724469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 43.

The square root of 128724469 is about 11345.6806318528. The cubic root of 128724469 is about 504.9174377329.

The spelling of 128724469 in words is "one hundred twenty-eight million, seven hundred twenty-four thousand, four hundred sixty-nine".