261341089 has 4 divisors (see below), whose sum is σ = 263653956. Its totient is φ = 259028224.

The previous prime is 261341081. The next prime is 261341099. The reversal of 261341089 is 980143162.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19009600 + 242331489 = 4360^2 + 15567^2 .

It is a cyclic number.

It is not a de Polignac number, because 261341089 - 2³ = 261341081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261341081) 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, 1156264 + ... + 1156489.

It is an arithmetic number, because the mean of its divisors is an integer number (65913489).

Almost surely, 2^261341089 is an apocalyptic number.

It is an amenable number.

261341089 is a deficient number, since it is larger than the sum of its proper divisors (2312867).

261341089 is a wasteful number, since it uses less digits than its factorization.

261341089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2312866.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 261341089 is about 16166.0474142568. The cubic root of 261341089 is about 639.3459211157.

The spelling of 261341089 in words is "two hundred sixty-one million, three hundred forty-one thousand, eighty-nine".