25561043 has 4 divisors (see below), whose sum is σ = 26251920. Its totient is φ = 24870168.

The previous prime is 25561033. The next prime is 25561051. The reversal of 25561043 is 34016552.

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

It is a cyclic number.

It is not a de Polignac number, because 25561043 - 2¹⁰ = 25560019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25561033) 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, 345383 + ... + 345456.

It is an arithmetic number, because the mean of its divisors is an integer number (6562980).

Almost surely, 2^25561043 is an apocalyptic number.

25561043 is a deficient number, since it is larger than the sum of its proper divisors (690877).

25561043 is an equidigital number, since it uses as much as digits as its factorization.

25561043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690876.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 25561043 is about 5055.7930139593. The cubic root of 25561043 is about 294.5729452277.

Adding to 25561043 its reverse (34016552), we get a palindrome (59577595).

The spelling of 25561043 in words is "twenty-five million, five hundred sixty-one thousand, forty-three".