25540181 has 2 divisors, whose sum is σ = 25540182. Its totient is φ = 25540180.

The previous prime is 25540157. The next prime is 25540211. The reversal of 25540181 is 18104552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19439281 + 6100900 = 4409^2 + 2470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25540181 is a prime.

It is a super-2 number, since 2×25540181² = 1304601691025522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25540181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25540111) 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 as a sum of consecutive naturals, namely, 12770090 + 12770091.

It is an arithmetic number, because the mean of its divisors is an integer number (12770091).

Almost surely, 2^25540181 is an apocalyptic number.

It is an amenable number.

25540181 is a deficient number, since it is larger than the sum of its proper divisors (1).

25540181 is an equidigital number, since it uses as much as digits as its factorization.

25540181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 25540181 is about 5053.7294149964. The cubic root of 25540181 is about 294.4927834828.

The spelling of 25540181 in words is "twenty-five million, five hundred forty thousand, one hundred eighty-one".