25421065 has 4 divisors (see below), whose sum is σ = 30505284. Its totient is φ = 20336848.

The previous prime is 25421063. The next prime is 25421083. The reversal of 25421065 is 56012452.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15155449 + 10265616 = 3893^2 + 3204^2 .

It is a cyclic number.

It is not a de Polignac number, because 25421065 - 2¹ = 25421063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25421063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2542102 + ... + 2542111.

It is an arithmetic number, because the mean of its divisors is an integer number (7626321).

Almost surely, 2^25421065 is an apocalyptic number.

It is an amenable number.

25421065 is a deficient number, since it is larger than the sum of its proper divisors (5084219).

25421065 is an equidigital number, since it uses as much as digits as its factorization.

25421065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5084218.

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

The square root of 25421065 is about 5041.9306817924. The cubic root of 25421065 is about 294.0342448580.

The spelling of 25421065 in words is "twenty-five million, four hundred twenty-one thousand, sixty-five".