25641601 has 2 divisors, whose sum is σ = 25641602. Its totient is φ = 25641600.

The previous prime is 25641599. The next prime is 25641611. The reversal of 25641601 is 10614652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25000000 + 641601 = 5000^2 + 801^2 .

It is a cyclic number.

It is not a de Polignac number, because 25641601 - 2¹ = 25641599 is a prime.

Together with 25641599, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25641611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12820800 + 12820801.

It is an arithmetic number, because the mean of its divisors is an integer number (12820801).

Almost surely, 2^25641601 is an apocalyptic number.

It is an amenable number.

25641601 is a deficient number, since it is larger than the sum of its proper divisors (1).

25641601 is an equidigital number, since it uses as much as digits as its factorization.

25641601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 25641601 is about 5063.7536472463. The cubic root of 25641601 is about 294.8820786951.

It can be divided in two parts, 25 and 641601, that multiplied together give a square (16040025 = 4005²).

The spelling of 25641601 in words is "twenty-five million, six hundred forty-one thousand, six hundred one".