261464289 has 12 divisors (see below), whose sum is σ = 352612176. Its totient is φ = 172335328.

The previous prime is 261464279. The next prime is 261464303. The reversal of 261464289 is 982464162.

261464289 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261464289 - 2¹¹ = 261462241 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 261464289.

It is not an unprimeable number, because it can be changed into a prime (261464249) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18262 + ... + 29264.

It is an arithmetic number, because the mean of its divisors is an integer number (29384348).

Almost surely, 2^261464289 is an apocalyptic number.

It is an amenable number.

261464289 is a deficient number, since it is larger than the sum of its proper divisors (91147887).

261464289 is an equidigital number, since it uses as much as digits as its factorization.

261464289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11184 (or 11095 counting only the distinct ones).

The product of its digits is 165888, while the sum is 42.

The square root of 261464289 is about 16169.8574205217. The cubic root of 261464289 is about 639.4463709961.

The spelling of 261464289 in words is "two hundred sixty-one million, four hundred sixty-four thousand, two hundred eighty-nine".