25081801 has 2 divisors, whose sum is σ = 25081802. Its totient is φ = 25081800.

The previous prime is 25081787. The next prime is 25081811. The reversal of 25081801 is 10818052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24000201 + 1081600 = 4899^2 + 1040^2 .

It is a cyclic number.

It is not a de Polignac number, because 25081801 - 2⁹ = 25081289 is a prime.

It is not a weakly prime, because it can be changed into another prime (25081811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12540900 + 12540901.

It is an arithmetic number, because the mean of its divisors is an integer number (12540901).

Almost surely, 2^25081801 is an apocalyptic number.

It is an amenable number.

25081801 is a deficient number, since it is larger than the sum of its proper divisors (1).

25081801 is an equidigital number, since it uses as much as digits as its factorization.

25081801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 25081801 is about 5008.1734195213. The cubic root of 25081801 is about 292.7203433827.

Adding to 25081801 its reverse (10818052), we get a palindrome (35899853).

The spelling of 25081801 in words is "twenty-five million, eighty-one thousand, eight hundred one".