25508121 has 4 divisors (see below), whose sum is σ = 34010832. Its totient is φ = 17005412.

The previous prime is 25508113. The next prime is 25508123. The reversal of 25508121 is 12180552.

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 25508121 - 2³ = 25508113 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25508091 and 25508100.

It is not an unprimeable number, because it can be changed into a prime (25508123) 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, 4251351 + ... + 4251356.

It is an arithmetic number, because the mean of its divisors is an integer number (8502708).

Almost surely, 2^25508121 is an apocalyptic number.

It is an amenable number.

25508121 is a deficient number, since it is larger than the sum of its proper divisors (8502711).

25508121 is an equidigital number, since it uses as much as digits as its factorization.

25508121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8502710.

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 25508121 is about 5050.5565039904. The cubic root of 25508121 is about 294.3695085547.

Adding to 25508121 its reverse (12180552), we get a palindrome (37688673).

The spelling of 25508121 in words is "twenty-five million, five hundred eight thousand, one hundred twenty-one".