25128163 has 4 divisors (see below), whose sum is σ = 25139808. Its totient is φ = 25116520.

The previous prime is 25128161. The next prime is 25128223. The reversal of 25128163 is 36182152.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25128163 - 2¹ = 25128161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25128161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1531 + ... + 7252.

It is an arithmetic number, because the mean of its divisors is an integer number (6284952).

Almost surely, 2^25128163 is an apocalyptic number.

25128163 is a deficient number, since it is larger than the sum of its proper divisors (11645).

25128163 is an equidigital number, since it uses as much as digits as its factorization.

25128163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11644.

The product of its digits is 2880, while the sum is 28.

The square root of 25128163 is about 5012.7999162145. The cubic root of 25128163 is about 292.9005902396.

The spelling of 25128163 in words is "twenty-five million, one hundred twenty-eight thousand, one hundred sixty-three".