327139385521 has 9 divisors (see below), whose sum is σ = 354247741281. Its totient is φ = 301967953872.

The previous prime is 327139385519. The next prime is 327139385533. The reversal of 327139385521 is 125583931723.

The square root of 327139385521 is 571961.

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

It can be written as a sum of positive squares in 4 ways, for example, as 124495359921 + 202644025600 = 352839^2 + 450160^2 .

It is not a de Polignac number, because 327139385521 - 2¹ = 327139385519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (327139385621) 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, 7413495 + ... + 7457491.

Almost surely, 2^327139385521 is an apocalyptic number.

327139385521 is the 571961-st square number.

327139385521 is the 285981-st centered octagonal number.

It is an amenable number.

327139385521 is a deficient number, since it is larger than the sum of its proper divisors (27108355760).

327139385521 is an frugal number, since it uses more digits than its factorization.

327139385521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88020 (or 44010 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 49.

Multiplying 327139385521 by its sum of digits (49), we get a square (16029829890529 = 4003727²).

The spelling of 327139385521 in words is "three hundred twenty-seven billion, one hundred thirty-nine million, three hundred eighty-five thousand, five hundred twenty-one".