25545121 has 6 divisors (see below), whose sum is σ = 29715810. Its totient is φ = 21895776.

The previous prime is 25545089. The next prime is 25545127. The reversal of 25545121 is 12154552.

It can be written as a sum of positive squares in only one way, i.e., 24010000 + 1535121 = 4900^2 + 1239^2 .

It is not a de Polignac number, because 25545121 - 2⁵ = 25545089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25545127) 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 5 ways as a sum of consecutive naturals, for example, 260616 + ... + 260713.

It is an arithmetic number, because the mean of its divisors is an integer number (4952635).

Almost surely, 2^25545121 is an apocalyptic number.

It is an amenable number.

25545121 is a deficient number, since it is larger than the sum of its proper divisors (4170689).

25545121 is an equidigital number, since it uses as much as digits as its factorization.

25545121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521343 (or 521336 counting only the distinct ones).

The product of its digits is 2000, while the sum is 25.

The square root of 25545121 is about 5054.2181393367. The cubic root of 25545121 is about 294.5117692601.

Adding to 25545121 its reverse (12154552), we get a palindrome (37699673).

The spelling of 25545121 in words is "twenty-five million, five hundred forty-five thousand, one hundred twenty-one".