25858961 has 2 divisors, whose sum is σ = 25858962. Its totient is φ = 25858960.

The previous prime is 25858957. The next prime is 25858979. The reversal of 25858961 is 16985852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16248961 + 9610000 = 4031^2 + 3100^2 .

It is a cyclic number.

It is not a de Polignac number, because 25858961 - 2² = 25858957 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

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

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25858361) 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, 12929480 + 12929481.

It is an arithmetic number, because the mean of its divisors is an integer number (12929481).

Almost surely, 2^25858961 is an apocalyptic number.

It is an amenable number.

25858961 is a deficient number, since it is larger than the sum of its proper divisors (1).

25858961 is an equidigital number, since it uses as much as digits as its factorization.

25858961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 44.

The square root of 25858961 is about 5085.1706952668. The cubic root of 25858961 is about 295.7129590452.

The spelling of 25858961 in words is "twenty-five million, eight hundred fifty-eight thousand, nine hundred sixty-one".