245622809 has 4 divisors (see below), whose sum is σ = 248054820. Its totient is φ = 243190800.

The previous prime is 245622763. The next prime is 245622857. The reversal of 245622809 is 908226542.

245622809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 109830400 + 135792409 = 10480^2 + 11653^2 .

It is a cyclic number.

It is not a de Polignac number, because 245622809 - 2¹² = 245618713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245622859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1215854 + ... + 1216055.

It is an arithmetic number, because the mean of its divisors is an integer number (62013705).

Almost surely, 2^245622809 is an apocalyptic number.

It is an amenable number.

245622809 is a deficient number, since it is larger than the sum of its proper divisors (2432011).

245622809 is a wasteful number, since it uses less digits than its factorization.

245622809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2432010.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 245622809 is about 15672.3581186751. The cubic root of 245622809 is about 626.2622460730.

The spelling of 245622809 in words is "two hundred forty-five million, six hundred twenty-two thousand, eight hundred nine".