25128271 has 4 divisors (see below), whose sum is σ = 28718032. Its totient is φ = 21538512.

The previous prime is 25128263. The next prime is 25128287. The reversal of 25128271 is 17282152.

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 25128271 - 2³ = 25128263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25128671) 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, 1794870 + ... + 1794883.

It is an arithmetic number, because the mean of its divisors is an integer number (7179508).

Almost surely, 2^25128271 is an apocalyptic number.

25128271 is a deficient number, since it is larger than the sum of its proper divisors (3589761).

25128271 is an equidigital number, since it uses as much as digits as its factorization.

25128271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3589760.

The product of its digits is 2240, while the sum is 28.

The square root of 25128271 is about 5012.8106886257. The cubic root of 25128271 is about 292.9010098646.

The spelling of 25128271 in words is "twenty-five million, one hundred twenty-eight thousand, two hundred seventy-one".