25384561 has 4 divisors (see below), whose sum is σ = 25398900. Its totient is φ = 25370224.

The previous prime is 25384549. The next prime is 25384591. The reversal of 25384561 is 16548352.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14861025 + 10523536 = 3855^2 + 3244^2 .

It is a cyclic number.

It is not a de Polignac number, because 25384561 - 2⁵ = 25384529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25384591) 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, 4066 + ... + 8203.

It is an arithmetic number, because the mean of its divisors is an integer number (6349725).

Almost surely, 2^25384561 is an apocalyptic number.

It is an amenable number.

25384561 is a deficient number, since it is larger than the sum of its proper divisors (14339).

25384561 is a wasteful number, since it uses less digits than its factorization.

25384561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14338.

The product of its digits is 28800, while the sum is 34.

The square root of 25384561 is about 5038.3093394511. The cubic root of 25384561 is about 293.8934355486.

The spelling of 25384561 in words is "twenty-five million, three hundred eighty-four thousand, five hundred sixty-one".