25211009 has 2 divisors, whose sum is σ = 25211010. Its totient is φ = 25211008.

The previous prime is 25210993. The next prime is 25211027. The reversal of 25211009 is 90011252.

25211009 is nontrivially palindromic in base 16.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25200400 + 10609 = 5020^2 + 103^2 .

It is a cyclic number.

It is not a de Polignac number, because 25211009 - 2⁴ = 25210993 is a prime.

It is not a weakly prime, because it can be changed into another prime (25211099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12605504 + 12605505.

It is an arithmetic number, because the mean of its divisors is an integer number (12605505).

Almost surely, 2^25211009 is an apocalyptic number.

It is an amenable number.

25211009 is a deficient number, since it is larger than the sum of its proper divisors (1).

25211009 is an equidigital number, since it uses as much as digits as its factorization.

25211009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 25211009 is about 5021.0565621192. The cubic root of 25211009 is about 293.2221288468. Note that the first 3 decimals are identical.

The spelling of 25211009 in words is "twenty-five million, two hundred eleven thousand, nine".