209430041605 has 8 divisors (see below), whose sum is σ = 251319202200. Its totient is φ = 167541931776.

The previous prime is 209430041599. The next prime is 209430041641. The reversal of 209430041605 is 506140034902.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4011702244 + 205418339361 = 63338^2 + 453231^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 209430041605 - 2¹³ = 209430033413 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 276361 + ... + 703729.

It is an arithmetic number, because the mean of its divisors is an integer number (31414900275).

Almost surely, 2^209430041605 is an apocalyptic number.

It is an amenable number.

209430041605 is a deficient number, since it is larger than the sum of its proper divisors (41889160595).

209430041605 is an equidigital number, since it uses as much as digits as its factorization.

209430041605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525383.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 209430041605 in words is "two hundred nine billion, four hundred thirty million, forty-one thousand, six hundred five".