209839439241 has 24 divisors (see below), whose sum is σ = 315700082880. Its totient is φ = 139282036272.

The previous prime is 209839439221. The next prime is 209839439261. The reversal of 209839439241 is 142934938902.

209839439241 is a `hidden beast` number, since 2 + 0 + 9 + 8 + 394 + 3 + 9 + 241 = 666.

It is an interprime number because it is at equal distance from previous prime (209839439221) and next prime (209839439261).

It is not a de Polignac number, because 209839439241 - 2¹⁹ = 209838914953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (209839439221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1829805 + ... + 1941098.

It is an arithmetic number, because the mean of its divisors is an integer number (13154170120).

Almost surely, 2^209839439241 is an apocalyptic number.

It is an amenable number.

209839439241 is a deficient number, since it is larger than the sum of its proper divisors (105860643639).

209839439241 is an equidigital number, since it uses as much as digits as its factorization.

209839439241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3771147 (or 3771135 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

The spelling of 209839439241 in words is "two hundred nine billion, eight hundred thirty-nine million, four hundred thirty-nine thousand, two hundred forty-one".