25981641 has 20 divisors (see below), whose sum is σ = 44357632. Its totient is φ = 14846328.

The previous prime is 25981621. The next prime is 25981643. The reversal of 25981641 is 14618952.

25981641 is a `hidden beast` number, since 2 + 5 + 9 + 8 + 1 + 641 = 666.

It is not a de Polignac number, because 25981641 - 2⁵ = 25981609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25981596 and 25981605.

It is not an unprimeable number, because it can be changed into a prime (25981643) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 22345 + ... + 23478.

Almost surely, 2^25981641 is an apocalyptic number.

25981641 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25981641 is a deficient number, since it is larger than the sum of its proper divisors (18375991).

25981641 is an equidigital number, since it uses as much as digits as its factorization.

25981641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45842 (or 45833 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 25981641 is about 5097.2189476223. The cubic root of 25981641 is about 296.1798616204.

The spelling of 25981641 in words is "twenty-five million, nine hundred eighty-one thousand, six hundred forty-one".