1213545717 has 12 divisors (see below), whose sum is σ = 1785973644. Its totient is φ = 793765440.

The previous prime is 1213545673. The next prime is 1213545727. The reversal of 1213545717 is 7175453121.

It can be written as a sum of positive squares in 2 ways, for example, as 720439281 + 493106436 = 26841^2 + 22206^2 .

It is not a de Polignac number, because 1213545717 - 2⁶ = 1213545653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213545727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1271584 + ... + 1272537.

It is an arithmetic number, because the mean of its divisors is an integer number (148831137).

Almost surely, 2^1213545717 is an apocalyptic number.

It is an amenable number.

1213545717 is a deficient number, since it is larger than the sum of its proper divisors (572427927).

1213545717 is a wasteful number, since it uses less digits than its factorization.

1213545717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2544180 (or 2544177 counting only the distinct ones).

The product of its digits is 29400, while the sum is 36.

The square root of 1213545717 is about 34835.9830778464. The cubic root of 1213545717 is about 1066.6420823218.

Adding to 1213545717 its reverse (7175453121), we get a palindrome (8388998838).

The spelling of 1213545717 in words is "one billion, two hundred thirteen million, five hundred forty-five thousand, seven hundred seventeen".