25842581 has 2 divisors, whose sum is σ = 25842582. Its totient is φ = 25842580.

The previous prime is 25842577. The next prime is 25842599. The reversal of 25842581 is 18524852.

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., 25654225 + 188356 = 5065^2 + 434^2 .

It is a cyclic number.

It is not a de Polignac number, because 25842581 - 2² = 25842577 is a prime.

It is a super-2 number, since 2×25842581² = 1335677985483122, 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 (25842521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12921290 + 12921291.

It is an arithmetic number, because the mean of its divisors is an integer number (12921291).

Almost surely, 2^25842581 is an apocalyptic number.

It is an amenable number.

25842581 is a deficient number, since it is larger than the sum of its proper divisors (1).

25842581 is an equidigital number, since it uses as much as digits as its factorization.

25842581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25600, while the sum is 35.

The square root of 25842581 is about 5083.5598747335. The cubic root of 25842581 is about 295.6505074335.

The spelling of 25842581 in words is "twenty-five million, eight hundred forty-two thousand, five hundred eighty-one".