25000001 has 12 divisors (see below), whose sum is σ = 28009980. Its totient is φ = 22276800.

The previous prime is 24999983. The next prime is 25000009. The reversal of 25000001 is 10000052.

It is a Cunningham number, because it is equal to 5000²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 11895601 + 13104400 = 3449^2 + 3620^2 .

It is a de Polignac number, because none of the positive numbers 2^k-25000001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25000009) 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 11 ways as a sum of consecutive naturals, for example, 2351 + ... + 7451.

It is an arithmetic number, because the mean of its divisors is an integer number (2334165).

Almost surely, 2^25000001 is an apocalyptic number.

It is an amenable number.

25000001 is a deficient number, since it is larger than the sum of its proper divisors (3009979).

25000001 is a wasteful number, since it uses less digits than its factorization.

25000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5156 (or 5143 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 8.

The square root of 25000001 is about 5000.0001000000. Note that the first 3 decimals coincide. The cubic root of 25000001 is about 292.4017777200.

Adding to 25000001 its reverse (10000052), we get a palindrome (35000053).

The spelling of 25000001 in words is "twenty-five million, one", and thus it is an aban number and an uban number.