27393891121 has 3 divisors (see below), whose sum is σ = 27394056633. Its totient is φ = 27393725610.

The previous prime is 27393891113. The next prime is 27393891197. The reversal of 27393891121 is 12119839372.

The square root of 27393891121 is 165511.

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

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 not a de Polignac number, because 27393891121 - 2³ = 27393891113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27393891821) 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 2 ways as a sum of consecutive naturals, for example, 82756 + ... + 248266.

It is an arithmetic number, because the mean of its divisors is an integer number (9131352211).

Almost surely, 2^27393891121 is an apocalyptic number.

27393891121 is the 165511-st square number.

27393891121 is the 82756-th centered octagonal number.

It is an amenable number.

27393891121 is a deficient number, since it is larger than the sum of its proper divisors (165512).

27393891121 is an frugal number, since it uses more digits than its factorization.

27393891121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331022 (or 165511 counting only the distinct ones).

The product of its digits is 163296, while the sum is 46.

The spelling of 27393891121 in words is "twenty-seven billion, three hundred ninety-three million, eight hundred ninety-one thousand, one hundred twenty-one".