25921271 has 2 divisors, whose sum is σ = 25921272. Its totient is φ = 25921270.

The previous prime is 25921267. The next prime is 25921309. The reversal of 25921271 is 17212952.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25921271 - 2² = 25921267 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25921211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12960635 + 12960636.

It is an arithmetic number, because the mean of its divisors is an integer number (12960636).

Almost surely, 2^25921271 is an apocalyptic number.

25921271 is a deficient number, since it is larger than the sum of its proper divisors (1).

25921271 is an equidigital number, since it uses as much as digits as its factorization.

25921271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 29.

The square root of 25921271 is about 5091.2936470017. The cubic root of 25921271 is about 295.9502861177.

The spelling of 25921271 in words is "twenty-five million, nine hundred twenty-one thousand, two hundred seventy-one".