27393229081 has 27 divisors (see below), whose sum is σ = 29980241919. Its totient is φ = 25024960800.

The previous prime is 27393229079. The next prime is 27393229093. The reversal of 27393229081 is 18092239372.

The square root of 27393229081 is 165509.

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., 18512051481 + 8881177600 = 136059^2 + 94240^2 .

It is not a de Polignac number, because 27393229081 - 2¹ = 27393229079 is a prime.

It is a super-2 number, since 2×27393229081² (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 (27393229051) 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 26 ways as a sum of consecutive naturals, for example, 97484661 + ... + 97484941.

Almost surely, 2^27393229081 is an apocalyptic number.

27393229081 is the 165509-th square number.

27393229081 is the 82755-th centered octagonal number.

It is an amenable number.

27393229081 is a deficient number, since it is larger than the sum of its proper divisors (2587012838).

27393229081 is an frugal number, since it uses more digits than its factorization.

27393229081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662 (or 331 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 27393229081 in words is "twenty-seven billion, three hundred ninety-three million, two hundred twenty-nine thousand, eighty-one".