25575421 has 4 divisors (see below), whose sum is σ = 25587612. Its totient is φ = 25563232.

The previous prime is 25575413. The next prime is 25575427. The reversal of 25575421 is 12457552.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4972900 + 20602521 = 2230^2 + 4539^2 .

It is a cyclic number.

It is not a de Polignac number, because 25575421 - 2³ = 25575413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25575427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2056 + ... + 7441.

It is an arithmetic number, because the mean of its divisors is an integer number (6396903).

Almost surely, 2^25575421 is an apocalyptic number.

It is an amenable number.

25575421 is a deficient number, since it is larger than the sum of its proper divisors (12191).

25575421 is an equidigital number, since it uses as much as digits as its factorization.

25575421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12190.

The product of its digits is 14000, while the sum is 31.

The square root of 25575421 is about 5057.2147472695. The cubic root of 25575421 is about 294.6281669692.

The spelling of 25575421 in words is "twenty-five million, five hundred seventy-five thousand, four hundred twenty-one".