25809161 has 8 divisors (see below), whose sum is σ = 29980224. Its totient is φ = 21759120.

The previous prime is 25809109. The next prime is 25809181. The reversal of 25809161 is 16190852.

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 25809161 - 2¹⁸ = 25547017 is a prime.

It is a super-2 number, since 2×25809161² = 1332225583047842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25809181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29795 + ... + 30648.

It is an arithmetic number, because the mean of its divisors is an integer number (3747528).

Almost surely, 2^25809161 is an apocalyptic number.

It is an amenable number.

25809161 is a deficient number, since it is larger than the sum of its proper divisors (4171063).

25809161 is an equidigital number, since it uses as much as digits as its factorization.

25809161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60511.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 25809161 is about 5080.2717447003. The cubic root of 25809161 is about 295.5230059495.

The spelling of 25809161 in words is "twenty-five million, eight hundred nine thousand, one hundred sixty-one".