261041089 has 4 divisors (see below), whose sum is σ = 267111856. Its totient is φ = 254970324.

The previous prime is 261041083. The next prime is 261041113. The reversal of 261041089 is 980140162.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261041089 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 261041089.

It is not an unprimeable number, because it can be changed into a prime (261041083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3035319 + ... + 3035404.

It is an arithmetic number, because the mean of its divisors is an integer number (66777964).

Almost surely, 2^261041089 is an apocalyptic number.

It is an amenable number.

261041089 is a deficient number, since it is larger than the sum of its proper divisors (6070767).

261041089 is an equidigital number, since it uses as much as digits as its factorization.

261041089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6070766.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 261041089 is about 16156.7660439829. The cubic root of 261041089 is about 639.1011870327.

The spelling of 261041089 in words is "two hundred sixty-one million, forty-one thousand, eighty-nine".