861512017 has 2 divisors, whose sum is σ = 861512018. Its totient is φ = 861512016.

The previous prime is 861511997. The next prime is 861512051. The reversal of 861512017 is 710215168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 756470016 + 105042001 = 27504^2 + 10249^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861512017 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 861512017.

It is not a weakly prime, because it can be changed into another prime (861510017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430756008 + 430756009.

It is an arithmetic number, because the mean of its divisors is an integer number (430756009).

Almost surely, 2^861512017 is an apocalyptic number.

It is an amenable number.

861512017 is a deficient number, since it is larger than the sum of its proper divisors (1).

861512017 is an equidigital number, since it uses as much as digits as its factorization.

861512017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 31.

The square root of 861512017 is about 29351.5249518658. The cubic root of 861512017 is about 951.5255330689.

The spelling of 861512017 in words is "eight hundred sixty-one million, five hundred twelve thousand, seventeen".