25842561 has 16 divisors (see below), whose sum is σ = 35735040. Its totient is φ = 16594560.

The previous prime is 25842521. The next prime is 25842563. The reversal of 25842561 is 16524852.

It is not a de Polignac number, because 25842561 - 2⁶ = 25842497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25842563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24501 + ... + 25533.

It is an arithmetic number, because the mean of its divisors is an integer number (2233440).

Almost surely, 2^25842561 is an apocalyptic number.

It is an amenable number.

25842561 is a deficient number, since it is larger than the sum of its proper divisors (9892479).

25842561 is a wasteful number, since it uses less digits than its factorization.

25842561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336.

The product of its digits is 19200, while the sum is 33.

The square root of 25842561 is about 5083.5579076076. The cubic root of 25842561 is about 295.6504311639.

The spelling of 25842561 in words is "twenty-five million, eight hundred forty-two thousand, five hundred sixty-one".