25845551 has 2 divisors, whose sum is σ = 25845552. Its totient is φ = 25845550.

The previous prime is 25845509. The next prime is 25845569. The reversal of 25845551 is 15554852.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25845551 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25845581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12922775 + 12922776.

It is an arithmetic number, because the mean of its divisors is an integer number (12922776).

Almost surely, 2^25845551 is an apocalyptic number.

25845551 is a deficient number, since it is larger than the sum of its proper divisors (1).

25845551 is an equidigital number, since it uses as much as digits as its factorization.

25845551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40000, while the sum is 35.

The square root of 25845551 is about 5083.8519844700. The cubic root of 25845551 is about 295.6618330356.

The spelling of 25845551 in words is "twenty-five million, eight hundred forty-five thousand, five hundred fifty-one".