30936878209 has 4 divisors (see below), whose sum is σ = 31372608960. Its totient is φ = 30501147460.

The previous prime is 30936878177. The next prime is 30936878243. The reversal of 30936878209 is 90287863903.

It is a happy number.

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 an emirpimes, since its reverse is a distinct semiprime: 90287863903 = 19 ⋅4751992837.

It is a cyclic number.

It is not a de Polignac number, because 30936878209 - 2⁵ = 30936878177 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30936878209.

It is not an unprimeable number, because it can be changed into a prime (30936878809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217865269 + ... + 217865410.

It is an arithmetic number, because the mean of its divisors is an integer number (7843152240).

Almost surely, 2^30936878209 is an apocalyptic number.

It is an amenable number.

30936878209 is a deficient number, since it is larger than the sum of its proper divisors (435730751).

30936878209 is an equidigital number, since it uses as much as digits as its factorization.

30936878209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435730750.

The product of its (nonzero) digits is 3919104, while the sum is 55.

The spelling of 30936878209 in words is "thirty billion, nine hundred thirty-six million, eight hundred seventy-eight thousand, two hundred nine".