25533121 has 8 divisors (see below), whose sum is σ = 26312040. Its totient is φ = 24765312.

The previous prime is 25533077. The next prime is 25533139. The reversal of 25533121 is 12133552.

It can be written as a sum of positive squares in 4 ways, for example, as 921600 + 24611521 = 960^2 + 4961^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25533121 - 2⁷ = 25532993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25533092 and 25533101.

It is not an unprimeable number, because it can be changed into a prime (25533821) 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 7 ways as a sum of consecutive naturals, for example, 2011 + ... + 7423.

It is an arithmetic number, because the mean of its divisors is an integer number (3289005).

Almost surely, 2^25533121 is an apocalyptic number.

It is an amenable number.

25533121 is a deficient number, since it is larger than the sum of its proper divisors (778919).

25533121 is an equidigital number, since it uses as much as digits as its factorization.

25533121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5555.

The product of its digits is 900, while the sum is 22.

The square root of 25533121 is about 5053.0308726545. The cubic root of 25533121 is about 294.4656457131.

Adding to 25533121 its reverse (12133552), we get a palindrome (37666673).

The spelling of 25533121 in words is "twenty-five million, five hundred thirty-three thousand, one hundred twenty-one".