128630401 has 2 divisors, whose sum is σ = 128630402. Its totient is φ = 128630400.

The previous prime is 128630387. The next prime is 128630431. The reversal of 128630401 is 104036821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81721600 + 46908801 = 9040^2 + 6849^2 .

It is a cyclic number.

It is not a de Polignac number, because 128630401 - 2⁹ = 128629889 is a prime.

It is a super-2 number, since 2×128630401² = 33091560122841602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128630431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64315200 + 64315201.

It is an arithmetic number, because the mean of its divisors is an integer number (64315201).

Almost surely, 2^128630401 is an apocalyptic number.

It is an amenable number.

128630401 is a deficient number, since it is larger than the sum of its proper divisors (1).

128630401 is an equidigital number, since it uses as much as digits as its factorization.

128630401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 128630401 is about 11341.5343318265. The cubic root of 128630401 is about 504.7944148964.

The spelling of 128630401 in words is "one hundred twenty-eight million, six hundred thirty thousand, four hundred one".