25020561 has 4 divisors (see below), whose sum is σ = 33360752. Its totient is φ = 16680372.

The previous prime is 25020557. The next prime is 25020563. The reversal of 25020561 is 16502052.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 25020561 - 2² = 25020557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25020563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4170091 + ... + 4170096.

It is an arithmetic number, because the mean of its divisors is an integer number (8340188).

Almost surely, 2^25020561 is an apocalyptic number.

It is an amenable number.

25020561 is a deficient number, since it is larger than the sum of its proper divisors (8340191).

25020561 is an equidigital number, since it uses as much as digits as its factorization.

25020561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8340190.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 25020561 is about 5002.0556774190. The cubic root of 25020561 is about 292.4819128271.

The spelling of 25020561 in words is "twenty-five million, twenty thousand, five hundred sixty-one".