1312121033 has 4 divisors (see below), whose sum is σ = 1328730240. Its totient is φ = 1295511828.

The previous prime is 1312121009. The next prime is 1312121051. The reversal of 1312121033 is 3301212131.

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.

It is a cyclic number.

It is not a de Polignac number, because 1312121033 - 2¹² = 1312116937 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 (1312121533) 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, 8304485 + ... + 8304642.

It is an arithmetic number, because the mean of its divisors is an integer number (332182560).

Almost surely, 2^1312121033 is an apocalyptic number.

It is an amenable number.

1312121033 is a deficient number, since it is larger than the sum of its proper divisors (16609207).

1312121033 is an equidigital number, since it uses as much as digits as its factorization.

1312121033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16609206.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1312121033 is about 36223.2112463818. The cubic root of 1312121033 is about 1094.7743974803.

Adding to 1312121033 its reverse (3301212131), we get a palindrome (4613333164).

The spelling of 1312121033 in words is "one billion, three hundred twelve million, one hundred twenty-one thousand, thirty-three".