25851779 has 2 divisors, whose sum is σ = 25851780. Its totient is φ = 25851778.

The previous prime is 25851769. The next prime is 25851797. The reversal of 25851779 is 97715852.

Together with next prime (25851797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25851779 - 2²⁰ = 24803203 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25851769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12925889 + 12925890.

It is an arithmetic number, because the mean of its divisors is an integer number (12925890).

Almost surely, 2^25851779 is an apocalyptic number.

25851779 is a deficient number, since it is larger than the sum of its proper divisors (1).

25851779 is an equidigital number, since it uses as much as digits as its factorization.

25851779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 176400, while the sum is 44.

The square root of 25851779 is about 5084.4644752422. The cubic root of 25851779 is about 295.6855796630.

The spelling of 25851779 in words is "twenty-five million, eight hundred fifty-one thousand, seven hundred seventy-nine".