261646089 has 8 divisors (see below), whose sum is σ = 353640672. Its totient is φ = 172041120.

The previous prime is 261646087. The next prime is 261646097. The reversal of 261646089 is 980646162.

261646089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261646089 - 2¹ = 261646087 is a prime.

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 261646089.

It is not an unprimeable number, because it can be changed into a prime (261646087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 597147 + ... + 597584.

It is an arithmetic number, because the mean of its divisors is an integer number (44205084).

Almost surely, 2^261646089 is an apocalyptic number.

It is an amenable number.

261646089 is a deficient number, since it is larger than the sum of its proper divisors (91994583).

261646089 is a wasteful number, since it uses less digits than its factorization.

261646089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1194807.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 261646089 is about 16175.4780145750. The cubic root of 261646089 is about 639.5945421763.

The spelling of 261646089 in words is "two hundred sixty-one million, six hundred forty-six thousand, eighty-nine".