25261603 has 2 divisors, whose sum is σ = 25261604. Its totient is φ = 25261602.

The previous prime is 25261591. The next prime is 25261661. The reversal of 25261603 is 30616252.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25261603 - 2⁵ = 25261571 is a prime.

It is a super-2 number, since 2×25261603² = 1276297172259218, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25261673) 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 as a sum of consecutive naturals, namely, 12630801 + 12630802.

It is an arithmetic number, because the mean of its divisors is an integer number (12630802).

Almost surely, 2^25261603 is an apocalyptic number.

25261603 is a deficient number, since it is larger than the sum of its proper divisors (1).

25261603 is an equidigital number, since it uses as much as digits as its factorization.

25261603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 25261603 is about 5026.0922196076. The cubic root of 25261603 is about 293.4181459587.

Adding to 25261603 its reverse (30616252), we get a palindrome (55877855).

The spelling of 25261603 in words is "twenty-five million, two hundred sixty-one thousand, six hundred three".