25489609 has 2 divisors, whose sum is σ = 25489610. Its totient is φ = 25489608.

The previous prime is 25489601. The next prime is 25489627. The reversal of 25489609 is 90698452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25351225 + 138384 = 5035^2 + 372^2 .

It is a cyclic number.

It is not a de Polignac number, because 25489609 - 2³ = 25489601 is a prime.

It is a super-3 number, since 3×25489609³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (25489601) 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, 12744804 + 12744805.

It is an arithmetic number, because the mean of its divisors is an integer number (12744805).

Almost surely, 2^25489609 is an apocalyptic number.

It is an amenable number.

25489609 is a deficient number, since it is larger than the sum of its proper divisors (1).

25489609 is an equidigital number, since it uses as much as digits as its factorization.

25489609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 25489609 is about 5048.7235020349. The cubic root of 25489609 is about 294.2982804266.

The spelling of 25489609 in words is "twenty-five million, four hundred eighty-nine thousand, six hundred nine".