25633121 has 4 divisors (see below), whose sum is σ = 25681044. Its totient is φ = 25585200.

The previous prime is 25633103. The next prime is 25633133. The reversal of 25633121 is 12133652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17430625 + 8202496 = 4175^2 + 2864^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25633121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25633141) 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, 23150 + ... + 24231.

It is an arithmetic number, because the mean of its divisors is an integer number (6420261).

Almost surely, 2^25633121 is an apocalyptic number.

It is an amenable number.

25633121 is a deficient number, since it is larger than the sum of its proper divisors (47923).

25633121 is an equidigital number, since it uses as much as digits as its factorization.

25633121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47922.

The product of its digits is 1080, while the sum is 23.

The square root of 25633121 is about 5062.9162544921. The cubic root of 25633121 is about 294.8495680400.

Adding to 25633121 its reverse (12133652), we get a palindrome (37766773).

The spelling of 25633121 in words is "twenty-five million, six hundred thirty-three thousand, one hundred twenty-one".