1215312243 has 8 divisors (see below), whose sum is σ = 1620577728. Its totient is φ = 810127464.

The previous prime is 1215312239. The next prime is 1215312247. The reversal of 1215312243 is 3422135121.

It is an interprime number because it is at equal distance from previous prime (1215312239) and next prime (1215312247).

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

It is not a de Polignac number, because 1215312243 - 2² = 1215312239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1215312247) 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 7 ways as a sum of consecutive naturals, for example, 45580 + ... + 67142.

It is an arithmetic number, because the mean of its divisors is an integer number (202572216).

Almost surely, 2^1215312243 is an apocalyptic number.

1215312243 is a deficient number, since it is larger than the sum of its proper divisors (405265485).

1215312243 is a wasteful number, since it uses less digits than its factorization.

1215312243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40353.

The product of its digits is 1440, while the sum is 24.

The square root of 1215312243 is about 34861.3287612506. The cubic root of 1215312243 is about 1067.1593921627.

Adding to 1215312243 its reverse (3422135121), we get a palindrome (4637447364).

The spelling of 1215312243 in words is "one billion, two hundred fifteen million, three hundred twelve thousand, two hundred forty-three".