261017 has 2 divisors, whose sum is σ = 261018. Its totient is φ = 261016.

The previous prime is 261013. The next prime is 261031. The reversal of 261017 is 710162.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 259081 + 1936 = 509^2 + 44^2 .

It is a cyclic number.

It is not a de Polignac number, because 261017 - 2² = 261013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 260986 and 261004.

It is not a weakly prime, because it can be changed into another prime (261011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130508 + 130509.

It is an arithmetic number, because the mean of its divisors is an integer number (130509).

2²⁶¹⁰¹⁷ is an apocalyptic number.

It is an amenable number.

261017 is a deficient number, since it is larger than the sum of its proper divisors (1).

261017 is an equidigital number, since it uses as much as digits as its factorization.

261017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 261017 is about 510.8982286131. The cubic root of 261017 is about 63.9081527571.

Adding to 261017 its reverse (710162), we get a palindrome (971179).

The spelling of 261017 in words is "two hundred sixty-one thousand, seventeen".