245640609 has 12 divisors (see below), whose sum is σ = 357165952. Its totient is φ = 162675000.

The previous prime is 245640601. The next prime is 245640611. The reversal of 245640609 is 906046542.

245640609 is a `hidden beast` number, since 2 + 4 + 5 + 6 + 40 + 609 = 666.

It is not a de Polignac number, because 245640609 - 2³ = 245640601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245640601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89017 + ... + 91734.

Almost surely, 2^245640609 is an apocalyptic number.

It is an amenable number.

245640609 is a deficient number, since it is larger than the sum of its proper divisors (111525343).

245640609 is a wasteful number, since it uses less digits than its factorization.

245640609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180908 (or 180905 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 245640609 is about 15672.9259871921. The cubic root of 245640609 is about 626.2773738737.

The spelling of 245640609 in words is "two hundred forty-five million, six hundred forty thousand, six hundred nine".