839585531521 has 9 divisors (see below), whose sum is σ = 922861291233. Its totient is φ = 763250411220.

The previous prime is 839585531459. The next prime is 839585531569. The reversal of 839585531521 is 125135585938.

The square root of 839585531521 is 916289.

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

It is not a de Polignac number, because 839585531521 - 2²³ = 839577142913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (839585541521) 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, 10037530 + ... + 10120828.

Almost surely, 2^839585531521 is an apocalyptic number.

839585531521 is the 916289-th square number.

839585531521 is the 458145-th centered octagonal number.

It is an amenable number.

839585531521 is a deficient number, since it is larger than the sum of its proper divisors (83275759712).

839585531521 is an frugal number, since it uses more digits than its factorization.

839585531521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166620 (or 83310 counting only the distinct ones).

The product of its digits is 6480000, while the sum is 55.

The spelling of 839585531521 in words is "eight hundred thirty-nine billion, five hundred eighty-five million, five hundred thirty-one thousand, five hundred twenty-one".