25409261 has 2 divisors, whose sum is σ = 25409262. Its totient is φ = 25409260.

The previous prime is 25409239. The next prime is 25409291. The reversal of 25409261 is 16290452.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24940036 + 469225 = 4994^2 + 685^2 .

It is a cyclic number.

It is not a de Polignac number, because 25409261 - 2¹⁸ = 25147117 is a prime.

It is a super-2 number, since 2×25409261² = 1291261089132242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25409221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12704630 + 12704631.

It is an arithmetic number, because the mean of its divisors is an integer number (12704631).

Almost surely, 2^25409261 is an apocalyptic number.

It is an amenable number.

25409261 is a deficient number, since it is larger than the sum of its proper divisors (1).

25409261 is an equidigital number, since it uses as much as digits as its factorization.

25409261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 25409261 is about 5040.7599625453. The cubic root of 25409261 is about 293.9887272584.

The spelling of 25409261 in words is "twenty-five million, four hundred nine thousand, two hundred sixty-one".