261611 has 12 divisors (see below), whose sum is σ = 321480.
Its totient is φ = 211680.
The previous prime is 261601. The next prime is 261619. The reversal of 261611 is 116162.
Adding to 261611 its reverse (116162), we get a palindrome (377773).
It can be divided in two parts, 26161 and 1, that added together give a palindrome (26162).
It is a happy number.
It is not a de Polignac number, because 261611 - 210 = 260587 is a prime.
It is a self number, because there is not a number n which added to its sum of digits gives 261611.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 261611.
It is not an unprimeable number, because it can be changed into a prime (261619) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 791 + ... + 1071.
It is an arithmetic number, because the mean of its divisors is an integer number (26790).
2261611 is an apocalyptic number.
261611 is a deficient number, since it is larger than the sum of its proper divisors (59869).
261611 is a wasteful number, since it uses less digits than its factorization.
261611 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 314 (or 307 counting only the distinct ones).
The product of its digits is 72, while the sum is 17.
The square root of 261611 is about 511.4792273397.
The cubic root of 261611 is about 63.9565949181.
The spelling of 261611 in words is "two hundred sixty-one thousand, six hundred eleven".