1215232313 has 4 divisors (see below), whose sum is σ = 1220074128. Its totient is φ = 1210390500.

The previous prime is 1215232307. The next prime is 1215232321. The reversal of 1215232313 is 3132325121.

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: 3132325121 = 15031 ⋅208391.

It is a cyclic number.

It is not a de Polignac number, because 1215232313 - 2¹⁴ = 1215215929 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1215231313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2420531 + ... + 2421032.

It is an arithmetic number, because the mean of its divisors is an integer number (305018532).

Almost surely, 2^1215232313 is an apocalyptic number.

It is an amenable number.

1215232313 is a deficient number, since it is larger than the sum of its proper divisors (4841815).

1215232313 is an equidigital number, since it uses as much as digits as its factorization.

1215232313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4841814.

The product of its digits is 1080, while the sum is 23.

The square root of 1215232313 is about 34860.1823431835. The cubic root of 1215232313 is about 1067.1359962767.

Adding to 1215232313 its reverse (3132325121), we get a palindrome (4347557434).

The spelling of 1215232313 in words is "one billion, two hundred fifteen million, two hundred thirty-two thousand, three hundred thirteen".