27387271081 has 9 divisors (see below), whose sum is σ = 27779832471. Its totient is φ = 27000187632.

The previous prime is 27387271073. The next prime is 27387271141. The reversal of 27387271081 is 18017278372.

The square root of 27387271081 is 165491.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 15546349225 + 11840921856 = 124685^2 + 108816^2 .

It is not a de Polignac number, because 27387271081 - 2³ = 27387271073 is a prime.

It is a super-2 number, since 2×27387271081² (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 (27387271181) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12079710 + ... + 12081976.

Almost surely, 2^27387271081 is an apocalyptic number.

27387271081 is the 165491-st square number.

27387271081 is the 82746-th centered octagonal number.

It is an amenable number.

27387271081 is a deficient number, since it is larger than the sum of its proper divisors (392561390).

27387271081 is an frugal number, since it uses more digits than its factorization.

27387271081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4680 (or 2340 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 46.

The spelling of 27387271081 in words is "twenty-seven billion, three hundred eighty-seven million, two hundred seventy-one thousand, eighty-one".