261442411 has 4 divisors (see below), whose sum is σ = 261620424. Its totient is φ = 261264400.

The previous prime is 261442399. The next prime is 261442417. The reversal of 261442411 is 114244162.

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

It is a cyclic number.

It is not a de Polignac number, because 261442411 - 2²¹ = 259345259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261442417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86785 + ... + 89746.

It is an arithmetic number, because the mean of its divisors is an integer number (65405106).

Almost surely, 2^261442411 is an apocalyptic number.

261442411 is a deficient number, since it is larger than the sum of its proper divisors (178013).

261442411 is a wasteful number, since it uses less digits than its factorization.

261442411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178012.

The product of its digits is 1536, while the sum is 25.

The square root of 261442411 is about 16169.1809007136. The cubic root of 261442411 is about 639.4285352934.

Adding to 261442411 its reverse (114244162), we get a palindrome (375686573).

The spelling of 261442411 in words is "two hundred sixty-one million, four hundred forty-two thousand, four hundred eleven".