25540201 has 4 divisors (see below), whose sum is σ = 25604932. Its totient is φ = 25475472.

The previous prime is 25540181. The next prime is 25540211. The reversal of 25540201 is 10204552.

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 22080601 + 3459600 = 4699^2 + 1860^2 .

It is a cyclic number.

It is not a de Polignac number, because 25540201 - 2²³ = 17151593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25540211) 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, 31770 + ... + 32563.

It is an arithmetic number, because the mean of its divisors is an integer number (6401233).

Almost surely, 2^25540201 is an apocalyptic number.

It is an amenable number.

25540201 is a deficient number, since it is larger than the sum of its proper divisors (64731).

25540201 is an equidigital number, since it uses as much as digits as its factorization.

25540201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64730.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 25540201 is about 5053.7313937328. The cubic root of 25540201 is about 294.4928603533.

Adding to 25540201 its reverse (10204552), we get a palindrome (35744753).

The spelling of 25540201 in words is "twenty-five million, five hundred forty thousand, two hundred one".