1205117017 has 4 divisors (see below), whose sum is σ = 1297818340. Its totient is φ = 1112415696.

The previous prime is 1205117003. The next prime is 1205117071. The reversal of 1205117017 is 7107115021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 579316761 + 625800256 = 24069^2 + 25016^2 .

It is a cyclic number.

It is not a de Polignac number, because 1205117017 - 2¹⁹ = 1204592729 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1205116982 and 1205117000.

It is not an unprimeable number, because it can be changed into a prime (1205117087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46350642 + ... + 46350667.

It is an arithmetic number, because the mean of its divisors is an integer number (324454585).

Almost surely, 2^1205117017 is an apocalyptic number.

It is an amenable number.

1205117017 is a deficient number, since it is larger than the sum of its proper divisors (92701323).

1205117017 is an equidigital number, since it uses as much as digits as its factorization.

1205117017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92701322.

The product of its (nonzero) digits is 490, while the sum is 25.

The square root of 1205117017 is about 34714.7953616322. The cubic root of 1205117017 is about 1064.1668834027.

The spelling of 1205117017 in words is "one billion, two hundred five million, one hundred seventeen thousand, seventeen".