239661361 has 9 divisors (see below), whose sum is σ = 243578881. Its totient is φ = 235806592.

The previous prime is 239661349. The next prime is 239661391. The reversal of 239661361 is 163166932.

The square root of 239661361 is 15481.

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 68574961 + 171086400 = 8281^2 + 13080^2 .

It is not a de Polignac number, because 239661361 - 2⁵ = 239661329 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 239661361.

It is not an unprimeable number, because it can be changed into a prime (239661391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1749285 + ... + 1749421.

Almost surely, 2^239661361 is an apocalyptic number.

239661361 is the 15481-st square number.

239661361 is the 7741-st centered octagonal number.

It is an amenable number.

239661361 is a deficient number, since it is larger than the sum of its proper divisors (3917520).

239661361 is an frugal number, since it uses more digits than its factorization.

239661361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500 (or 250 counting only the distinct ones).

The product of its digits is 34992, while the sum is 37.

The cubic root of 239661361 is about 621.1540774701.

The spelling of 239661361 in words is "two hundred thirty-nine million, six hundred sixty-one thousand, three hundred sixty-one".