25603601 has 4 divisors (see below), whose sum is σ = 25857204. Its totient is φ = 25350000.

The previous prime is 25603597. The next prime is 25603603. The reversal of 25603601 is 10630652.

It is a Cunningham number, because it is equal to 5060²+1.

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

It can be written as a sum of positive squares in 2 ways, for example, as 24601600 + 1002001 = 4960^2 + 1001^2 .

It is a cyclic number.

It is not a de Polignac number, because 25603601 - 2² = 25603597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25603603) 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 in 3 ways as a sum of consecutive naturals, for example, 126650 + ... + 126851.

It is an arithmetic number, because the mean of its divisors is an integer number (6464301).

Almost surely, 2^25603601 is an apocalyptic number.

It is an amenable number.

25603601 is a deficient number, since it is larger than the sum of its proper divisors (253603).

25603601 is a wasteful number, since it uses less digits than its factorization.

25603601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253602.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 25603601 is about 5060.0000988142. Note that the first 4 decimals coincide. The cubic root of 25603601 is about 294.7363381990.

The spelling of 25603601 in words is "twenty-five million, six hundred three thousand, six hundred one".