842650909 has 4 divisors (see below), whose sum is σ = 842731360. Its totient is φ = 842570460.

The previous prime is 842650891. The next prime is 842650927. The reversal of 842650909 is 909056248.

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, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (842650891) and next prime (842650927).

It is a cyclic number.

It is not a de Polignac number, because 842650909 - 2²⁷ = 708433181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842656909) 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, 21657 + ... + 46414.

It is an arithmetic number, because the mean of its divisors is an integer number (210682840).

Almost surely, 2^842650909 is an apocalyptic number.

It is an amenable number.

842650909 is a deficient number, since it is larger than the sum of its proper divisors (80451).

842650909 is a wasteful number, since it uses less digits than its factorization.

842650909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80450.

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

The square root of 842650909 is about 29028.4499930671. The cubic root of 842650909 is about 944.5303075395.

The spelling of 842650909 in words is "eight hundred forty-two million, six hundred fifty thousand, nine hundred nine".