25561443 has 4 divisors (see below), whose sum is σ = 34081928. Its totient is φ = 17040960.

The previous prime is 25561439. The next prime is 25561447. The reversal of 25561443 is 34416552.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (25561439) and next prime (25561447).

It is not a de Polignac number, because 25561443 - 2² = 25561439 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25561443.

It is not an unprimeable number, because it can be changed into a prime (25561447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4260238 + ... + 4260243.

It is an arithmetic number, because the mean of its divisors is an integer number (8520482).

Almost surely, 2^25561443 is an apocalyptic number.

25561443 is a deficient number, since it is larger than the sum of its proper divisors (8520485).

25561443 is an equidigital number, since it uses as much as digits as its factorization.

25561443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8520484.

The product of its digits is 14400, while the sum is 30.

The square root of 25561443 is about 5055.8325723861. The cubic root of 25561443 is about 294.5744817921.

Adding to 25561443 its reverse (34416552), we get a palindrome (59977995).

The spelling of 25561443 in words is "twenty-five million, five hundred sixty-one thousand, four hundred forty-three".