261695329 has 9 divisors (see below), whose sum is σ = 304552881. Its totient is φ = 224213220.

The previous prime is 261695327. The next prime is 261695347. The reversal of 261695329 is 923596162.

The square root of 261695329 is 16177.

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

It is not a de Polignac number, because 261695329 - 2¹ = 261695327 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261695327) 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, 112084 + ... + 114394.

It is an arithmetic number, because the mean of its divisors is an integer number (33839209).

Almost surely, 2^261695329 is an apocalyptic number.

261695329 is the 16177-th square number.

261695329 is the 8089-th centered octagonal number.

It is an amenable number.

261695329 is a deficient number, since it is larger than the sum of its proper divisors (42857552).

261695329 is an frugal number, since it uses more digits than its factorization.

261695329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4636 (or 2318 counting only the distinct ones).

The product of its digits is 174960, while the sum is 43.

The cubic root of 261695329 is about 639.6346620955.

The spelling of 261695329 in words is "two hundred sixty-one million, six hundred ninety-five thousand, three hundred twenty-nine".