261210617 has 2 divisors, whose sum is σ = 261210618. Its totient is φ = 261210616.

The previous prime is 261210611. The next prime is 261210623. The reversal of 261210617 is 716012162.

It is a balanced prime because it is at equal distance from previous prime (261210611) and next prime (261210623).

It can be written as a sum of positive squares in only one way, i.e., 156025081 + 105185536 = 12491^2 + 10256^2 .

It is a cyclic number.

It is not a de Polignac number, because 261210617 - 2¹⁰ = 261209593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261210611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130605308 + 130605309.

It is an arithmetic number, because the mean of its divisors is an integer number (130605309).

Almost surely, 2^261210617 is an apocalyptic number.

It is an amenable number.

261210617 is a deficient number, since it is larger than the sum of its proper divisors (1).

261210617 is an equidigital number, since it uses as much as digits as its factorization.

261210617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 261210617 is about 16162.0115394093. The cubic root of 261210617 is about 639.2395076583.

Adding to 261210617 its reverse (716012162), we get a palindrome (977222779).

The spelling of 261210617 in words is "two hundred sixty-one million, two hundred ten thousand, six hundred seventeen".