25688121 has 4 divisors (see below), whose sum is σ = 34250832. Its totient is φ = 17125412.

The previous prime is 25688087. The next prime is 25688129. The reversal of 25688121 is 12188652.

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 25688121 - 2⁷ = 25687993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25688129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4281351 + ... + 4281356.

It is an arithmetic number, because the mean of its divisors is an integer number (8562708).

Almost surely, 2^25688121 is an apocalyptic number.

It is an amenable number.

25688121 is a deficient number, since it is larger than the sum of its proper divisors (8562711).

25688121 is an equidigital number, since it uses as much as digits as its factorization.

25688121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8562710.

The product of its digits is 7680, while the sum is 33.

The square root of 25688121 is about 5068.3449961501. The cubic root of 25688121 is about 295.0602998443.

The spelling of 25688121 in words is "twenty-five million, six hundred eighty-eight thousand, one hundred twenty-one".