261711117 has 6 divisors (see below), whose sum is σ = 378027182. Its totient is φ = 174474072.

The previous prime is 261711103. The next prime is 261711127. The reversal of 261711117 is 711117162.

It can be written as a sum of positive squares in only one way, i.e., 185340996 + 76370121 = 13614^2 + 8739^2 .

It is not a de Polignac number, because 261711117 - 2⁷ = 261710989 is a prime.

It is a super-2 number, since 2×261711117² = 136985417522775378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261711127) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14539498 + ... + 14539515.

Almost surely, 2^261711117 is an apocalyptic number.

It is an amenable number.

261711117 is a deficient number, since it is larger than the sum of its proper divisors (116316065).

261711117 is a wasteful number, since it uses less digits than its factorization.

261711117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29079019 (or 29079016 counting only the distinct ones).

The product of its digits is 588, while the sum is 27.

The square root of 261711117 is about 16177.4879693975. The cubic root of 261711117 is about 639.6475248254.

Adding to 261711117 its reverse (711117162), we get a palindrome (972828279).

The spelling of 261711117 in words is "two hundred sixty-one million, seven hundred eleven thousand, one hundred seventeen".