25321601 has 2 divisors, whose sum is σ = 25321602. Its totient is φ = 25321600.

The previous prime is 25321589. The next prime is 25321603. The reversal of 25321601 is 10612352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21381376 + 3940225 = 4624^2 + 1985^2 .

It is a cyclic number.

It is not a de Polignac number, because 25321601 - 2⁶ = 25321537 is a prime.

Together with 25321603, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25321603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12660800 + 12660801.

It is an arithmetic number, because the mean of its divisors is an integer number (12660801).

Almost surely, 2^25321601 is an apocalyptic number.

It is an amenable number.

25321601 is a deficient number, since it is larger than the sum of its proper divisors (1).

25321601 is an equidigital number, since it uses as much as digits as its factorization.

25321601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 25321601 is about 5032.0573327417. The cubic root of 25321601 is about 293.6502582147.

Adding to 25321601 its reverse (10612352), we get a palindrome (35933953).

The spelling of 25321601 in words is "twenty-five million, three hundred twenty-one thousand, six hundred one".