1312123229 has 4 divisors (see below), whose sum is σ = 1314479484. Its totient is φ = 1309766976.

The previous prime is 1312123213. The next prime is 1312123247. The reversal of 1312123229 is 9223212131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 246427204 + 1065696025 = 15698^2 + 32645^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312123229 - 2⁴ = 1312123213 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1312123198 and 1312123207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312123289) 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, 1177292 + ... + 1178405.

It is an arithmetic number, because the mean of its divisors is an integer number (328619871).

Almost surely, 2^1312123229 is an apocalyptic number.

It is an amenable number.

1312123229 is a deficient number, since it is larger than the sum of its proper divisors (2356255).

1312123229 is an equidigital number, since it uses as much as digits as its factorization.

1312123229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2356254.

The product of its digits is 1296, while the sum is 26.

The square root of 1312123229 is about 36223.2415584249. The cubic root of 1312123229 is about 1094.7750082276.

The spelling of 1312123229 in words is "one billion, three hundred twelve million, one hundred twenty-three thousand, two hundred twenty-nine".