261011017 has 2 divisors, whose sum is σ = 261011018. Its totient is φ = 261011016.

The previous prime is 261011011. The next prime is 261011021. The reversal of 261011017 is 710110162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 226683136 + 34327881 = 15056^2 + 5859^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261011017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261010985 and 261011003.

It is not a weakly prime, because it can be changed into another prime (261011011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130505508 + 130505509.

It is an arithmetic number, because the mean of its divisors is an integer number (130505509).

Almost surely, 2^261011017 is an apocalyptic number.

It is an amenable number.

261011017 is a deficient number, since it is larger than the sum of its proper divisors (1).

261011017 is an equidigital number, since it uses as much as digits as its factorization.

261011017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 19.

The square root of 261011017 is about 16155.8353853956. The cubic root of 261011017 is about 639.0766445504.

Adding to 261011017 its reverse (710110162), we get a palindrome (971121179).

The spelling of 261011017 in words is "two hundred sixty-one million, eleven thousand, seventeen".