25851391 has 2 divisors, whose sum is σ = 25851392. Its totient is φ = 25851390.

The previous prime is 25851389. The next prime is 25851401. The reversal of 25851391 is 19315852.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25851391 - 2¹ = 25851389 is a prime.

Together with 25851389, 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 (25854391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12925695 + 12925696.

It is an arithmetic number, because the mean of its divisors is an integer number (12925696).

Almost surely, 2^25851391 is an apocalyptic number.

25851391 is a deficient number, since it is larger than the sum of its proper divisors (1).

25851391 is an equidigital number, since it uses as much as digits as its factorization.

25851391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 34.

The square root of 25851391 is about 5084.4263196550. The cubic root of 25851391 is about 295.6841003763.

The spelling of 25851391 in words is "twenty-five million, eight hundred fifty-one thousand, three hundred ninety-one".