1213305717 has 16 divisors (see below), whose sum is σ = 1744258880. Its totient is φ = 745759872.

The previous prime is 1213305713. The next prime is 1213305773. The reversal of 1213305717 is 7175033121.

It is not a de Polignac number, because 1213305717 - 2² = 1213305713 is a prime.

It is a super-2 number, since 2×1213305717² = 2944221525809768178, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213305713) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15393 + ... + 51609.

It is an arithmetic number, because the mean of its divisors is an integer number (109016180).

Almost surely, 2^1213305717 is an apocalyptic number.

It is an amenable number.

1213305717 is a deficient number, since it is larger than the sum of its proper divisors (530953163).

1213305717 is a wasteful number, since it uses less digits than its factorization.

1213305717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37092.

The product of its (nonzero) digits is 4410, while the sum is 30.

The square root of 1213305717 is about 34832.5381934765. The cubic root of 1213305717 is about 1066.5717619447.

Adding to 1213305717 its reverse (7175033121), we get a palindrome (8388338838).

The spelling of 1213305717 in words is "one billion, two hundred thirteen million, three hundred five thousand, seven hundred seventeen".