1312123289 has 2 divisors, whose sum is σ = 1312123290. Its totient is φ = 1312123288.

The previous prime is 1312123273. The next prime is 1312123301. The reversal of 1312123289 is 9823212131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1285939600 + 26183689 = 35860^2 + 5117^2 .

It is an emirp because it is prime and its reverse (9823212131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1312123289 - 2⁴ = 1312123273 is a prime.

It is not a weakly prime, because it can be changed into another prime (1312123789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656061644 + 656061645.

It is an arithmetic number, because the mean of its divisors is an integer number (656061645).

Almost surely, 2^1312123289 is an apocalyptic number.

It is an amenable number.

1312123289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312123289 is an equidigital number, since it uses as much as digits as its factorization.

1312123289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 1312123289 is about 36223.2423866224. The cubic root of 1312123289 is about 1094.7750249147.

The spelling of 1312123289 in words is "one billion, three hundred twelve million, one hundred twenty-three thousand, two hundred eighty-nine".