261866941 has 16 divisors (see below), whose sum is σ = 303086080. Its totient is φ = 221616000.

The previous prime is 261866933. The next prime is 261866953. The reversal of 261866941 is 149668162.

It is a cyclic number.

It is not a de Polignac number, because 261866941 - 2³ = 261866933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261866141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 348316 + ... + 349066.

It is an arithmetic number, because the mean of its divisors is an integer number (18942880).

Almost surely, 2^261866941 is an apocalyptic number.

It is an amenable number.

261866941 is a deficient number, since it is larger than the sum of its proper divisors (41219139).

261866941 is a wasteful number, since it uses less digits than its factorization.

261866941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324.

The product of its digits is 124416, while the sum is 43.

The square root of 261866941 is about 16182.3033280185. The cubic root of 261866941 is about 639.7744493287.

The spelling of 261866941 in words is "two hundred sixty-one million, eight hundred sixty-six thousand, nine hundred forty-one".