25850921 has 2 divisors, whose sum is σ = 25850922. Its totient is φ = 25850920.

The previous prime is 25850917. The next prime is 25850947. The reversal of 25850921 is 12905852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25806400 + 44521 = 5080^2 + 211^2 .

It is a cyclic number.

It is not a de Polignac number, because 25850921 - 2² = 25850917 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (25850911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12925460 + 12925461.

It is an arithmetic number, because the mean of its divisors is an integer number (12925461).

Almost surely, 2^25850921 is an apocalyptic number.

It is an amenable number.

25850921 is a deficient number, since it is larger than the sum of its proper divisors (1).

25850921 is an equidigital number, since it uses as much as digits as its factorization.

25850921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 25850921 is about 5084.3800998745. The cubic root of 25850921 is about 295.6823084371.

The spelling of 25850921 in words is "twenty-five million, eight hundred fifty thousand, nine hundred twenty-one".