25205105 has 8 divisors (see below), whose sum is σ = 30279912. Its totient is φ = 20141568.

The previous prime is 25205099. The next prime is 25205107. The reversal of 25205105 is 50150252.

It can be written as a sum of positive squares in 4 ways, for example, as 2917264 + 22287841 = 1708^2 + 4721^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25205105 - 2⁶ = 25205041 is a prime.

It is a super-2 number, since 2×25205105² = 1270594636122050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25205107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3329 + ... + 7841.

It is an arithmetic number, because the mean of its divisors is an integer number (3784989).

Almost surely, 2^25205105 is an apocalyptic number.

It is an amenable number.

25205105 is a deficient number, since it is larger than the sum of its proper divisors (5074807).

25205105 is a wasteful number, since it uses less digits than its factorization.

25205105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5635.

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 25205105 is about 5020.4686036266. The cubic root of 25205105 is about 293.1992378073.

Adding to 25205105 its reverse (50150252), we get a palindrome (75355357).

The spelling of 25205105 in words is "twenty-five million, two hundred five thousand, one hundred five".