128424949 has 2 divisors, whose sum is σ = 128424950. Its totient is φ = 128424948.

The previous prime is 128424943. The next prime is 128424973. The reversal of 128424949 is 949424821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92640625 + 35784324 = 9625^2 + 5982^2 .

It is a cyclic number.

It is not a de Polignac number, because 128424949 - 2³ = 128424941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128424941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64212474 + 64212475.

It is an arithmetic number, because the mean of its divisors is an integer number (64212475).

Almost surely, 2^128424949 is an apocalyptic number.

It is an amenable number.

128424949 is a deficient number, since it is larger than the sum of its proper divisors (1).

128424949 is an equidigital number, since it uses as much as digits as its factorization.

128424949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 43.

The square root of 128424949 is about 11332.4732075571. The cubic root of 128424949 is about 504.5255145248.

The spelling of 128424949 in words is "one hundred twenty-eight million, four hundred twenty-four thousand, nine hundred forty-nine".