25820161 has 8 divisors (see below), whose sum is σ = 27582984. Its totient is φ = 24084480.

The previous prime is 25820159. The next prime is 25820209. The reversal of 25820161 is 16102852.

It can be written as a sum of positive squares in 4 ways, for example, as 3600 + 25816561 = 60^2 + 5081^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25820161 - 2¹ = 25820159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25820101) 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 in 7 ways as a sum of consecutive naturals, for example, 4800 + ... + 8641.

It is an arithmetic number, because the mean of its divisors is an integer number (3447873).

Almost surely, 2^25820161 is an apocalyptic number.

It is an amenable number.

25820161 is a deficient number, since it is larger than the sum of its proper divisors (1762823).

25820161 is a wasteful number, since it uses less digits than its factorization.

25820161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13571.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 25820161 is about 5081.3542486231. The cubic root of 25820161 is about 295.5649844721.

The spelling of 25820161 in words is "twenty-five million, eight hundred twenty thousand, one hundred sixty-one".