1216315313 has 4 divisors (see below), whose sum is σ = 1222683648. Its totient is φ = 1209946980.

The previous prime is 1216315277. The next prime is 1216315351. The reversal of 1216315313 is 3135136121.

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: 3135136121 = 13 ⋅241164317.

It is a cyclic number.

It is not a de Polignac number, because 1216315313 - 2⁸ = 1216315057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216615313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3183881 + ... + 3184262.

It is an arithmetic number, because the mean of its divisors is an integer number (305670912).

Almost surely, 2^1216315313 is an apocalyptic number.

It is an amenable number.

1216315313 is a deficient number, since it is larger than the sum of its proper divisors (6368335).

1216315313 is an equidigital number, since it uses as much as digits as its factorization.

1216315313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6368334.

The product of its digits is 1620, while the sum is 26.

The square root of 1216315313 is about 34875.7123654844. The cubic root of 1216315313 is about 1067.4529082843.

The spelling of 1216315313 in words is "one billion, two hundred sixteen million, three hundred fifteen thousand, three hundred thirteen".