1312215133 has 4 divisors (see below), whose sum is σ = 1342731808. Its totient is φ = 1281698460.

The previous prime is 1312215053. The next prime is 1312215187. The reversal of 1312215133 is 3315122131.

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: 3315122131 = 71 ⋅46691861.

It is a cyclic number.

It is not a de Polignac number, because 1312215133 - 2⁹ = 1312214621 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 (1312218133) 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, 15258273 + ... + 15258358.

It is an arithmetic number, because the mean of its divisors is an integer number (335682952).

Almost surely, 2^1312215133 is an apocalyptic number.

It is an amenable number.

1312215133 is a deficient number, since it is larger than the sum of its proper divisors (30516675).

1312215133 is an equidigital number, since it uses as much as digits as its factorization.

1312215133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30516674.

The product of its digits is 540, while the sum is 22.

The square root of 1312215133 is about 36224.5101140098. The cubic root of 1312215133 is about 1094.8005677816.

Adding to 1312215133 its reverse (3315122131), we get a palindrome (4627337264).

The spelling of 1312215133 in words is "one billion, three hundred twelve million, two hundred fifteen thousand, one hundred thirty-three".