25405121 has 4 divisors (see below), whose sum is σ = 29034432. Its totient is φ = 21775812.

The previous prime is 25405111. The next prime is 25405141. The reversal of 25405121 is 12150452.

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 a de Polignac number, because none of the positive numbers 2^k-25405121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25405093 and 25405102.

It is not an unprimeable number, because it can be changed into a prime (25405111) 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, 1814645 + ... + 1814658.

It is an arithmetic number, because the mean of its divisors is an integer number (7258608).

Almost surely, 2^25405121 is an apocalyptic number.

It is an amenable number.

25405121 is a deficient number, since it is larger than the sum of its proper divisors (3629311).

25405121 is an equidigital number, since it uses as much as digits as its factorization.

25405121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3629310.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 25405121 is about 5040.3492934518. The cubic root of 25405121 is about 293.9727595969.

Adding to 25405121 its reverse (12150452), we get a palindrome (37555573).

The spelling of 25405121 in words is "twenty-five million, four hundred five thousand, one hundred twenty-one".