25973581 has 2 divisors, whose sum is σ = 25973582. Its totient is φ = 25973580.

The previous prime is 25973579. The next prime is 25973587. The reversal of 25973581 is 18537952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22610025 + 3363556 = 4755^2 + 1834^2 .

It is a cyclic number.

It is not a de Polignac number, because 25973581 - 2¹ = 25973579 is a prime.

It is a super-2 number, since 2×25973581² = 1349253819927122, which contains 22 as substring.

Together with 25973579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25973587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12986790 + 12986791.

It is an arithmetic number, because the mean of its divisors is an integer number (12986791).

Almost surely, 2^25973581 is an apocalyptic number.

It is an amenable number.

25973581 is a deficient number, since it is larger than the sum of its proper divisors (1).

25973581 is an equidigital number, since it uses as much as digits as its factorization.

25973581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 40.

The square root of 25973581 is about 5096.4282590850. The cubic root of 25973581 is about 296.1492315744.

The spelling of 25973581 in words is "twenty-five million, nine hundred seventy-three thousand, five hundred eighty-one".