25681291 has 2 divisors, whose sum is σ = 25681292. Its totient is φ = 25681290.

The previous prime is 25681289. The next prime is 25681319. The reversal of 25681291 is 19218652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25681291 - 2¹ = 25681289 is a prime.

Together with 25681289, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25681231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12840645 + 12840646.

It is an arithmetic number, because the mean of its divisors is an integer number (12840646).

Almost surely, 2^25681291 is an apocalyptic number.

25681291 is a deficient number, since it is larger than the sum of its proper divisors (1).

25681291 is an equidigital number, since it uses as much as digits as its factorization.

25681291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 34.

The square root of 25681291 is about 5067.6711613916. The cubic root of 25681291 is about 295.0341471532.

The spelling of 25681291 in words is "twenty-five million, six hundred eighty-one thousand, two hundred ninety-one".