16128449 has 2 divisors, whose sum is σ = 16128450. Its totient is φ = 16128448.

The previous prime is 16128439. The next prime is 16128487. The reversal of 16128449 is 94482161.

It is a happy number.

16128449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9878449 + 6250000 = 3143^2 + 2500^2 .

It is a cyclic number.

It is not a de Polignac number, because 16128449 - 2²⁰ = 15079873 is a prime.

It is not a weakly prime, because it can be changed into another prime (16128419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8064224 + 8064225.

It is an arithmetic number, because the mean of its divisors is an integer number (8064225).

Almost surely, 2^16128449 is an apocalyptic number.

It is an amenable number.

16128449 is a deficient number, since it is larger than the sum of its proper divisors (1).

16128449 is an equidigital number, since it uses as much as digits as its factorization.

16128449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 35.

The square root of 16128449 is about 4016.0240288126. The cubic root of 16128449 is about 252.6567284988.

The spelling of 16128449 in words is "sixteen million, one hundred twenty-eight thousand, four hundred forty-nine".