128149863 has 4 divisors (see below), whose sum is σ = 170866488. Its totient is φ = 85433240.

The previous prime is 128149843. The next prime is 128149867. The reversal of 128149863 is 368941821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128149863 - 2⁸ = 128149607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128149867) 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, 21358308 + ... + 21358313.

It is an arithmetic number, because the mean of its divisors is an integer number (42716622).

Almost surely, 2^128149863 is an apocalyptic number.

128149863 is a deficient number, since it is larger than the sum of its proper divisors (42716625).

128149863 is an equidigital number, since it uses as much as digits as its factorization.

128149863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42716624.

The product of its digits is 82944, while the sum is 42.

The square root of 128149863 is about 11320.3296330098. The cubic root of 128149863 is about 504.1650261116.

The spelling of 128149863 in words is "one hundred twenty-eight million, one hundred forty-nine thousand, eight hundred sixty-three".