25732121 has 2 divisors, whose sum is σ = 25732122. Its totient is φ = 25732120.

The previous prime is 25732081. The next prime is 25732129. The reversal of 25732121 is 12123752.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15721225 + 10010896 = 3965^2 + 3164^2 .

It is a cyclic number.

It is not a de Polignac number, because 25732121 - 2¹⁴ = 25715737 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25732129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12866060 + 12866061.

It is an arithmetic number, because the mean of its divisors is an integer number (12866061).

Almost surely, 2^25732121 is an apocalyptic number.

It is an amenable number.

25732121 is a deficient number, since it is larger than the sum of its proper divisors (1).

25732121 is an equidigital number, since it uses as much as digits as its factorization.

25732121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840, while the sum is 23.

The square root of 25732121 is about 5072.6838064283. The cubic root of 25732121 is about 295.2286688189.

Adding to 25732121 its reverse (12123752), we get a palindrome (37855873).

The spelling of 25732121 in words is "twenty-five million, seven hundred thirty-two thousand, one hundred twenty-one".