128463409 has 2 divisors, whose sum is σ = 128463410. Its totient is φ = 128463408.

The previous prime is 128463347. The next prime is 128463431. The reversal of 128463409 is 904364821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127757809 + 705600 = 11303^2 + 840^2 .

It is a cyclic number.

It is not a de Polignac number, because 128463409 - 2⁷ = 128463281 is a prime.

It is not a weakly prime, because it can be changed into another prime (128463449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64231704 + 64231705.

It is an arithmetic number, because the mean of its divisors is an integer number (64231705).

Almost surely, 2^128463409 is an apocalyptic number.

It is an amenable number.

128463409 is a deficient number, since it is larger than the sum of its proper divisors (1).

128463409 is an equidigital number, since it uses as much as digits as its factorization.

128463409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 128463409 is about 11334.1699740210. The cubic root of 128463409 is about 504.5758736769.

The spelling of 128463409 in words is "one hundred twenty-eight million, four hundred sixty-three thousand, four hundred nine".