239591649361 has 9 divisors (see below), whose sum is σ = 254523152401. Its totient is φ = 225490191232.

The previous prime is 239591649347. The next prime is 239591649391. The reversal of 239591649361 is 163946195932.

The square root of 239591649361 is 489481.

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 822599761 + 238769049600 = 28681^2 + 488640^2 .

It is not a de Polignac number, because 239591649361 - 2⁵ = 239591649329 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 239591649296 and 239591649305.

It is not an unprimeable number, because it can be changed into a prime (239591649391) 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, 8306781 + ... + 8335573.

Almost surely, 2^239591649361 is an apocalyptic number.

239591649361 is the 489481-st square number.

239591649361 is the 244741-st centered octagonal number.

It is an amenable number.

239591649361 is a deficient number, since it is larger than the sum of its proper divisors (14931503040).

239591649361 is an frugal number, since it uses more digits than its factorization.

239591649361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57620 (or 28810 counting only the distinct ones).

The product of its digits is 9447840, while the sum is 58.

The spelling of 239591649361 in words is "two hundred thirty-nine billion, five hundred ninety-one million, six hundred forty-nine thousand, three hundred sixty-one".