1205213617 has 8 divisors (see below), whose sum is σ = 1247538176. Its totient is φ = 1163402352.

The previous prime is 1205213563. The next prime is 1205213671. The reversal of 1205213617 is 7163125021.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1205213563) and next prime (1205213671).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1205213617 - 2²⁷ = 1070995889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1205213677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123543 + ... + 132940.

It is an arithmetic number, because the mean of its divisors is an integer number (155942272).

Almost surely, 2^1205213617 is an apocalyptic number.

It is an amenable number.

1205213617 is a deficient number, since it is larger than the sum of its proper divisors (42324559).

1205213617 is a wasteful number, since it uses less digits than its factorization.

1205213617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256647.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 1205213617 is about 34716.1866713497. The cubic root of 1205213617 is about 1064.1953165404.

Adding to 1205213617 its reverse (7163125021), we get a palindrome (8368338638).

The spelling of 1205213617 in words is "one billion, two hundred five million, two hundred thirteen thousand, six hundred seventeen".