25551601 has 4 divisors (see below), whose sum is σ = 25567092. Its totient is φ = 25536112.

The previous prime is 25551587. The next prime is 25551607. The reversal of 25551601 is 10615552.

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 5085025 + 20466576 = 2255^2 + 4524^2 .

It is a cyclic number.

It is not a de Polignac number, because 25551601 - 2¹¹ = 25549553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25551607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4930 + ... + 8683.

It is an arithmetic number, because the mean of its divisors is an integer number (6391773).

Almost surely, 2^25551601 is an apocalyptic number.

It is an amenable number.

25551601 is a deficient number, since it is larger than the sum of its proper divisors (15491).

25551601 is a wasteful number, since it uses less digits than its factorization.

25551601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15490.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 25551601 is about 5054.8591473947. The cubic root of 25551601 is about 294.5366699697.

The spelling of 25551601 in words is "twenty-five million, five hundred fifty-one thousand, six hundred one".