39585479521 has 27 divisors (see below), whose sum is σ = 47215643283. Its totient is φ = 33091193520.

The previous prime is 39585479513. The next prime is 39585479537. The reversal of 39585479521 is 12597458593.

The square root of 39585479521 is 198961.

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., 31431389521 + 8154090000 = 177289^2 + 90300^2 .

It is not a de Polignac number, because 39585479521 - 2³ = 39585479513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39585479581) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 59886931 + ... + 59887591.

It is an arithmetic number, because the mean of its divisors is an integer number (1748727529).

Almost surely, 2^39585479521 is an apocalyptic number.

39585479521 is the 198961-st square number.

39585479521 is the 99481-st centered octagonal number.

It is an amenable number.

39585479521 is a deficient number, since it is larger than the sum of its proper divisors (7630163762).

39585479521 is an frugal number, since it uses more digits than its factorization.

39585479521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1422 (or 711 counting only the distinct ones).

The product of its digits is 13608000, while the sum is 58.

The spelling of 39585479521 in words is "thirty-nine billion, five hundred eighty-five million, four hundred seventy-nine thousand, five hundred twenty-one".