25211609 has 2 divisors, whose sum is σ = 25211610. Its totient is φ = 25211608.

The previous prime is 25211567. The next prime is 25211617. The reversal of 25211609 is 90611252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19829209 + 5382400 = 4453^2 + 2320^2 .

It is a cyclic number.

It is not a de Polignac number, because 25211609 - 2¹² = 25207513 is a prime.

It is not a weakly prime, because it can be changed into another prime (25211639) 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 as a sum of consecutive naturals, namely, 12605804 + 12605805.

It is an arithmetic number, because the mean of its divisors is an integer number (12605805).

Almost surely, 2^25211609 is an apocalyptic number.

It is an amenable number.

25211609 is a deficient number, since it is larger than the sum of its proper divisors (1).

25211609 is an equidigital number, since it uses as much as digits as its factorization.

25211609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 25211609 is about 5021.1163101446. The cubic root of 25211609 is about 293.2244549719.

The spelling of 25211609 in words is "twenty-five million, two hundred eleven thousand, six hundred nine".