27019531109 has 4 divisors (see below), whose sum is σ = 27022797516. Its totient is φ = 27016264704.

The previous prime is 27019531103. The next prime is 27019531169. The reversal of 27019531109 is 90113591072.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16920286084 + 10099245025 = 130078^2 + 100495^2 .

It is a cyclic number.

It is not a de Polignac number, because 27019531109 - 2²⁴ = 27002753893 is a prime.

It is a super-2 number, since 2×27019531109² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27019531103) 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, 1620764 + ... + 1637349.

It is an arithmetic number, because the mean of its divisors is an integer number (6755699379).

Almost surely, 2^27019531109 is an apocalyptic number.

It is an amenable number.

27019531109 is a deficient number, since it is larger than the sum of its proper divisors (3266407).

27019531109 is an equidigital number, since it uses as much as digits as its factorization.

27019531109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3266406.

The product of its (nonzero) digits is 17010, while the sum is 38.

The spelling of 27019531109 in words is "twenty-seven billion, nineteen million, five hundred thirty-one thousand, one hundred nine".