25205641 has 4 divisors (see below), whose sum is σ = 25235712. Its totient is φ = 25175572.

The previous prime is 25205633. The next prime is 25205651. The reversal of 25205641 is 14650252.

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 25205641 - 2³ = 25205633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25205651) 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, 13741 + ... + 15466.

It is an arithmetic number, because the mean of its divisors is an integer number (6308928).

Almost surely, 2^25205641 is an apocalyptic number.

It is an amenable number.

25205641 is a deficient number, since it is larger than the sum of its proper divisors (30071).

25205641 is an equidigital number, since it uses as much as digits as its factorization.

25205641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30070.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 25205641 is about 5020.5219848139. The cubic root of 25205641 is about 293.2013161387.

Adding to 25205641 its reverse (14650252), we get a palindrome (39855893).

The spelling of 25205641 in words is "twenty-five million, two hundred five thousand, six hundred forty-one".