25603145 has 4 divisors (see below), whose sum is σ = 30723780. Its totient is φ = 20482512.

The previous prime is 25603133. The next prime is 25603157. The reversal of 25603145 is 54130652.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (25603133) and next prime (25603157).

It can be written as a sum of positive squares in 2 ways, for example, as 3286969 + 22316176 = 1813^2 + 4724^2 .

It is a cyclic number.

It is not a de Polignac number, because 25603145 - 2¹⁰ = 25602121 is a prime.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 2560310 + ... + 2560319.

It is an arithmetic number, because the mean of its divisors is an integer number (7680945).

Almost surely, 2^25603145 is an apocalyptic number.

It is an amenable number.

25603145 is a deficient number, since it is larger than the sum of its proper divisors (5120635).

25603145 is an equidigital number, since it uses as much as digits as its factorization.

25603145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5120634.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 25603145 is about 5059.9550393259. The cubic root of 25603145 is about 294.7345884377.

Adding to 25603145 its reverse (54130652), we get a palindrome (79733797).

The spelling of 25603145 in words is "twenty-five million, six hundred three thousand, one hundred forty-five".