25461009 has 24 divisors (see below), whose sum is σ = 42211520. Its totient is φ = 14486688.

The previous prime is 25460999. The next prime is 25461011. The reversal of 25461009 is 90016452.

It is not a de Polignac number, because 25461009 - 2⁷ = 25460881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25461049) 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 in 23 ways as a sum of consecutive naturals, for example, 16722 + ... + 18180.

Almost surely, 2^25461009 is an apocalyptic number.

It is an amenable number.

25461009 is a deficient number, since it is larger than the sum of its proper divisors (16750511).

25461009 is a wasteful number, since it uses less digits than its factorization.

25461009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1749 (or 1746 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 25461009 is about 5045.8903079635. The cubic root of 25461009 is about 294.1881691418.

The spelling of 25461009 in words is "twenty-five million, four hundred sixty-one thousand, nine".