128474609 has 2 divisors, whose sum is σ = 128474610. Its totient is φ = 128474608.

The previous prime is 128474587. The next prime is 128474651. The reversal of 128474609 is 906474821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105165025 + 23309584 = 10255^2 + 4828^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128474609 is a prime.

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 (128474659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64237304 + 64237305.

It is an arithmetic number, because the mean of its divisors is an integer number (64237305).

Almost surely, 2^128474609 is an apocalyptic number.

It is an amenable number.

128474609 is a deficient number, since it is larger than the sum of its proper divisors (1).

128474609 is an equidigital number, since it uses as much as digits as its factorization.

128474609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 128474609 is about 11334.6640444258. The cubic root of 128474609 is about 504.5905369588.

The spelling of 128474609 in words is "one hundred twenty-eight million, four hundred seventy-four thousand, six hundred nine".