27685323131 has 4 divisors (see below), whose sum is σ = 27685661664. Its totient is φ = 27684984600.

The previous prime is 27685323101. The next prime is 27685323179. The reversal of 27685323131 is 13132358672.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27685323131 is a prime.

It is a super-2 number, since 2×27685323131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27685323101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38021 + ... + 238361.

It is an arithmetic number, because the mean of its divisors is an integer number (6921415416).

Almost surely, 2^27685323131 is an apocalyptic number.

27685323131 is a deficient number, since it is larger than the sum of its proper divisors (338533).

27685323131 is a wasteful number, since it uses less digits than its factorization.

27685323131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338532.

The product of its digits is 181440, while the sum is 41.

The spelling of 27685323131 in words is "twenty-seven billion, six hundred eighty-five million, three hundred twenty-three thousand, one hundred thirty-one".