25506201 has 16 divisors (see below), whose sum is σ = 38943104. Its totient is φ = 14546304.

The previous prime is 25506193. The next prime is 25506203. The reversal of 25506201 is 10260552.

It is not a de Polignac number, because 25506201 - 2³ = 25506193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25506203) 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 15 ways as a sum of consecutive naturals, for example, 14565 + ... + 16221.

It is an arithmetic number, because the mean of its divisors is an integer number (2433944).

Almost surely, 2^25506201 is an apocalyptic number.

25506201 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25506201 is a deficient number, since it is larger than the sum of its proper divisors (13436903).

25506201 is a wasteful number, since it uses less digits than its factorization.

25506201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2400.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 25506201 is about 5050.3664223500. The cubic root of 25506201 is about 294.3621226240.

Adding to 25506201 its reverse (10260552), we get a palindrome (35766753).

The spelling of 25506201 in words is "twenty-five million, five hundred six thousand, two hundred one".