128721301 has 2 divisors, whose sum is σ = 128721302. Its totient is φ = 128721300.

The previous prime is 128721293. The next prime is 128721347. The reversal of 128721301 is 103127821.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123876900 + 4844401 = 11130^2 + 2201^2 .

It is an emirp because it is prime and its reverse (103127821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128721301 - 2³ = 128721293 is a prime.

It is a super-2 number, since 2×128721301² = 33138346662265202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128721361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64360650 + 64360651.

It is an arithmetic number, because the mean of its divisors is an integer number (64360651).

Almost surely, 2^128721301 is an apocalyptic number.

It is an amenable number.

128721301 is a deficient number, since it is larger than the sum of its proper divisors (1).

128721301 is an equidigital number, since it uses as much as digits as its factorization.

128721301 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 128721301 is about 11345.5410183913. The cubic root of 128721301 is about 504.9132955742.

The spelling of 128721301 in words is "one hundred twenty-eight million, seven hundred twenty-one thousand, three hundred one".