128432401 has 2 divisors, whose sum is σ = 128432402. Its totient is φ = 128432400.

The previous prime is 128432383. The next prime is 128432417. The reversal of 128432401 is 104234821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112869376 + 15563025 = 10624^2 + 3945^2 .

It is an emirp because it is prime and its reverse (104234821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128432401 - 2¹⁵ = 128399633 is a prime.

It is not a weakly prime, because it can be changed into another prime (128432441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64216200 + 64216201.

It is an arithmetic number, because the mean of its divisors is an integer number (64216201).

Almost surely, 2^128432401 is an apocalyptic number.

It is an amenable number.

128432401 is a deficient number, since it is larger than the sum of its proper divisors (1).

128432401 is an equidigital number, since it uses as much as digits as its factorization.

128432401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 128432401 is about 11332.8019924465. The cubic root of 128432401 is about 504.5352728868.

The spelling of 128432401 in words is "one hundred twenty-eight million, four hundred thirty-two thousand, four hundred one".