27135781 has 4 divisors (see below), whose sum is σ = 28564000. Its totient is φ = 25707564.

The previous prime is 27135767. The next prime is 27135799. The reversal of 27135781 is 18753172.

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 not a de Polignac number, because 27135781 - 2⁵ = 27135749 is a prime.

It is a super-2 number, since 2×27135781² = 1472701220959922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27135721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 714081 + ... + 714118.

It is an arithmetic number, because the mean of its divisors is an integer number (7141000).

Almost surely, 2^27135781 is an apocalyptic number.

It is an amenable number.

27135781 is a deficient number, since it is larger than the sum of its proper divisors (1428219).

27135781 is a wasteful number, since it uses less digits than its factorization.

27135781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1428218.

The product of its digits is 11760, while the sum is 34.

The square root of 27135781 is about 5209.2015702985. The cubic root of 27135781 is about 300.5020519367.

The spelling of 27135781 in words is "twenty-seven million, one hundred thirty-five thousand, seven hundred eighty-one".