128251401 has 4 divisors (see below), whose sum is σ = 171001872. Its totient is φ = 85500932.

The previous prime is 128251393. The next prime is 128251411. The reversal of 128251401 is 104152821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128251401 - 2³ = 128251393 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128251411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21375231 + ... + 21375236.

It is an arithmetic number, because the mean of its divisors is an integer number (42750468).

Almost surely, 2^128251401 is an apocalyptic number.

It is an amenable number.

128251401 is a deficient number, since it is larger than the sum of its proper divisors (42750471).

128251401 is an equidigital number, since it uses as much as digits as its factorization.

128251401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42750470.

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 128251401 is about 11324.8135083983. The cubic root of 128251401 is about 504.2981473202.

The spelling of 128251401 in words is "one hundred twenty-eight million, two hundred fifty-one thousand, four hundred one".