128290469 has 2 divisors, whose sum is σ = 128290470. Its totient is φ = 128290468.

The previous prime is 128290453. The next prime is 128290501. The reversal of 128290469 is 964092821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106853569 + 21436900 = 10337^2 + 4630^2 .

It is an emirp because it is prime and its reverse (964092821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128290469 - 2⁴ = 128290453 is a prime.

It is a super-2 number, since 2×128290469² = 32916888872479922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128290429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64145234 + 64145235.

It is an arithmetic number, because the mean of its divisors is an integer number (64145235).

Almost surely, 2^128290469 is an apocalyptic number.

It is an amenable number.

128290469 is a deficient number, since it is larger than the sum of its proper divisors (1).

128290469 is an equidigital number, since it uses as much as digits as its factorization.

128290469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 128290469 is about 11326.5382619757. The cubic root of 128290469 is about 504.3493486318.

The spelling of 128290469 in words is "one hundred twenty-eight million, two hundred ninety thousand, four hundred sixty-nine".