27311681 has 4 divisors (see below), whose sum is σ = 27475392. Its totient is φ = 27147972.

The previous prime is 27311657. The next prime is 27311689. The reversal of 27311681 is 18611372.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27311681 is a prime.

It is a super-2 number, since 2×27311681² = 1491855838091522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27311689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81605 + ... + 81938.

It is an arithmetic number, because the mean of its divisors is an integer number (6868848).

Almost surely, 2^27311681 is an apocalyptic number.

It is an amenable number.

27311681 is a deficient number, since it is larger than the sum of its proper divisors (163711).

27311681 is a wasteful number, since it uses less digits than its factorization.

27311681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163710.

The product of its digits is 2016, while the sum is 29.

The square root of 27311681 is about 5226.0578833381. The cubic root of 27311681 is about 301.1499604120.

The spelling of 27311681 in words is "twenty-seven million, three hundred eleven thousand, six hundred eighty-one".