25891849 has 2 divisors, whose sum is σ = 25891850. Its totient is φ = 25891848.

The previous prime is 25891841. The next prime is 25891883. The reversal of 25891849 is 94819852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20748025 + 5143824 = 4555^2 + 2268^2 .

It is a cyclic number.

It is not a de Polignac number, because 25891849 - 2³ = 25891841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25891799 and 25891808.

It is not a weakly prime, because it can be changed into another prime (25891841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12945924 + 12945925.

It is an arithmetic number, because the mean of its divisors is an integer number (12945925).

Almost surely, 2^25891849 is an apocalyptic number.

It is an amenable number.

25891849 is a deficient number, since it is larger than the sum of its proper divisors (1).

25891849 is an equidigital number, since it uses as much as digits as its factorization.

25891849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 46.

The square root of 25891849 is about 5088.4033841668. The cubic root of 25891849 is about 295.8382707016.

The spelling of 25891849 in words is "twenty-five million, eight hundred ninety-one thousand, eight hundred forty-nine".