842568609 has 4 divisors (see below), whose sum is σ = 1123424816. Its totient is φ = 561712404.

The previous prime is 842568599. The next prime is 842568619. The reversal of 842568609 is 906865248.

It is a happy number.

842568609 is nontrivially palindromic in base 11.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (842568599) and next prime (842568619).

It is not a de Polignac number, because 842568609 - 2¹³ = 842560417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (842568619) 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 3 ways as a sum of consecutive naturals, for example, 140428099 + ... + 140428104.

It is an arithmetic number, because the mean of its divisors is an integer number (280856204).

Almost surely, 2^842568609 is an apocalyptic number.

It is an amenable number.

842568609 is a deficient number, since it is larger than the sum of its proper divisors (280856207).

842568609 is a wasteful number, since it uses less digits than its factorization.

842568609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280856206.

The product of its (nonzero) digits is 829440, while the sum is 48.

The square root of 842568609 is about 29027.0323836248. The cubic root of 842568609 is about 944.4995564205.

The spelling of 842568609 in words is "eight hundred forty-two million, five hundred sixty-eight thousand, six hundred nine".