25620961 has 4 divisors (see below), whose sum is σ = 25631424. Its totient is φ = 25610500.

The previous prime is 25620953. The next prime is 25620967. The reversal of 25620961 is 16902652.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25620961 - 2³ = 25620953 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25620967) 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, 636 + ... + 7186.

It is an arithmetic number, because the mean of its divisors is an integer number (6407856).

Almost surely, 2^25620961 is an apocalyptic number.

It is an amenable number.

25620961 is a deficient number, since it is larger than the sum of its proper divisors (10463).

25620961 is an equidigital number, since it uses as much as digits as its factorization.

25620961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10462.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 25620961 is about 5061.7152231235. The cubic root of 25620961 is about 294.8029364724.

The spelling of 25620961 in words is "twenty-five million, six hundred twenty thousand, nine hundred sixty-one".