25128641 has 4 divisors (see below), whose sum is σ = 25713072. Its totient is φ = 24544212.

The previous prime is 25128619. The next prime is 25128643. The reversal of 25128641 is 14682152.

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 25128641 - 2⁶ = 25128577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25128643) 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, 292151 + ... + 292236.

It is an arithmetic number, because the mean of its divisors is an integer number (6428268).

Almost surely, 2^25128641 is an apocalyptic number.

It is an amenable number.

25128641 is a deficient number, since it is larger than the sum of its proper divisors (584431).

25128641 is an equidigital number, since it uses as much as digits as its factorization.

25128641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584430.

The product of its digits is 3840, while the sum is 29.

The square root of 25128641 is about 5012.8475939330. The cubic root of 25128641 is about 292.9024474598.

The spelling of 25128641 in words is "twenty-five million, one hundred twenty-eight thousand, six hundred forty-one".