25353561 has 4 divisors (see below), whose sum is σ = 33804752. Its totient is φ = 16902372.

The previous prime is 25353551. The next prime is 25353563. The reversal of 25353561 is 16535352.

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 25353561 - 2⁵ = 25353529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25353563) 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, 4225591 + ... + 4225596.

It is an arithmetic number, because the mean of its divisors is an integer number (8451188).

Almost surely, 2^25353561 is an apocalyptic number.

It is an amenable number.

25353561 is a deficient number, since it is larger than the sum of its proper divisors (8451191).

25353561 is an equidigital number, since it uses as much as digits as its factorization.

25353561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8451190.

The product of its digits is 13500, while the sum is 30.

The square root of 25353561 is about 5035.2319708232. The cubic root of 25353561 is about 293.7737511503.

The spelling of 25353561 in words is "twenty-five million, three hundred fifty-three thousand, five hundred sixty-one".