1217864013 has 4 divisors (see below), whose sum is σ = 1623818688. Its totient is φ = 811909340.

The previous prime is 1217863993. The next prime is 1217864059. The reversal of 1217864013 is 3104687121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3104687121 = 3 ⋅1034895707.

It is a cyclic number.

It is not a de Polignac number, because 1217864013 - 2⁵ = 1217863981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217864093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202977333 + ... + 202977338.

It is an arithmetic number, because the mean of its divisors is an integer number (405954672).

Almost surely, 2^1217864013 is an apocalyptic number.

It is an amenable number.

1217864013 is a deficient number, since it is larger than the sum of its proper divisors (405954675).

1217864013 is an equidigital number, since it uses as much as digits as its factorization.

1217864013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405954674.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 1217864013 is about 34897.9084330279. The cubic root of 1217864013 is about 1067.9057686994.

The spelling of 1217864013 in words is "one billion, two hundred seventeen million, eight hundred sixty-four thousand, thirteen".