25380561 has 16 divisors (see below), whose sum is σ = 36230400. Its totient is φ = 15756048.

The previous prime is 25380529. The next prime is 25380571. The reversal of 25380561 is 16508352.

It is not a de Polignac number, because 25380561 - 2⁵ = 25380529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25380571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 411 + ... + 7136.

It is an arithmetic number, because the mean of its divisors is an integer number (2264400).

Almost surely, 2^25380561 is an apocalyptic number.

It is an amenable number.

25380561 is a deficient number, since it is larger than the sum of its proper divisors (10849839).

25380561 is a wasteful number, since it uses less digits than its factorization.

25380561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7628.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 25380561 is about 5037.9123652561. The cubic root of 25380561 is about 293.8779978777.

The spelling of 25380561 in words is "twenty-five million, three hundred eighty thousand, five hundred sixty-one".