25521442 has 4 divisors (see below), whose sum is σ = 38282166. Its totient is φ = 12760720.

The previous prime is 25521413. The next prime is 25521469. The reversal of 25521442 is 24412552.

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

It can be written as a sum of positive squares in only one way, i.e., 24990001 + 531441 = 4999^2 + 729^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 6380359 + ... + 6380362.

Almost surely, 2^25521442 is an apocalyptic number.

25521442 is a deficient number, since it is larger than the sum of its proper divisors (12760724).

25521442 is a wasteful number, since it uses less digits than its factorization.

25521442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12760723.

The product of its digits is 3200, while the sum is 25.

The square root of 25521442 is about 5051.8750974267. The cubic root of 25521442 is about 294.4207420922.

Adding to 25521442 its reverse (24412552), we get a palindrome (49933994).

The spelling of 25521442 in words is "twenty-five million, five hundred twenty-one thousand, four hundred forty-two".