128331901 has 2 divisors, whose sum is σ = 128331902. Its totient is φ = 128331900.

The previous prime is 128331887. The next prime is 128331943. The reversal of 128331901 is 109133821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94109401 + 34222500 = 9701^2 + 5850^2 .

It is a cyclic number.

It is not a de Polignac number, because 128331901 - 2¹⁹ = 127807613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128331901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128331991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64165950 + 64165951.

It is an arithmetic number, because the mean of its divisors is an integer number (64165951).

Almost surely, 2^128331901 is an apocalyptic number.

It is an amenable number.

128331901 is a deficient number, since it is larger than the sum of its proper divisors (1).

128331901 is an equidigital number, since it uses as much as digits as its factorization.

128331901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 128331901 is about 11328.3670932752. The cubic root of 128331901 is about 504.4036367725.

The spelling of 128331901 in words is "one hundred twenty-eight million, three hundred thirty-one thousand, nine hundred one".