1217542223 has 4 divisors (see below), whose sum is σ = 1217866680. Its totient is φ = 1217217768.

The previous prime is 1217542219. The next prime is 1217542243. The reversal of 1217542223 is 3222457121.

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

It is a cyclic number.

It is not a de Polignac number, because 1217542223 - 2² = 1217542219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217542243) 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, 156533 + ... + 164126.

It is an arithmetic number, because the mean of its divisors is an integer number (304466670).

Almost surely, 2^1217542223 is an apocalyptic number.

1217542223 is a deficient number, since it is larger than the sum of its proper divisors (324457).

1217542223 is an equidigital number, since it uses as much as digits as its factorization.

1217542223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324456.

The product of its digits is 6720, while the sum is 29.

The square root of 1217542223 is about 34893.2976802136. The cubic root of 1217542223 is about 1067.8117046483.

Adding to 1217542223 its reverse (3222457121), we get a palindrome (4439999344).

The spelling of 1217542223 in words is "one billion, two hundred seventeen million, five hundred forty-two thousand, two hundred twenty-three".