1312123429 has 2 divisors, whose sum is σ = 1312123430. Its totient is φ = 1312123428.

The previous prime is 1312123399. The next prime is 1312123433. The reversal of 1312123429 is 9243212131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1193357025 + 118766404 = 34545^2 + 10898^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312123429 - 2⁷ = 1312123301 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1312123397 and 1312123406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312123469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656061714 + 656061715.

It is an arithmetic number, because the mean of its divisors is an integer number (656061715).

Almost surely, 2^1312123429 is an apocalyptic number.

It is an amenable number.

1312123429 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312123429 is an equidigital number, since it uses as much as digits as its factorization.

1312123429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 28.

The square root of 1312123429 is about 36223.2443190833. The cubic root of 1312123429 is about 1094.7750638512.

The spelling of 1312123429 in words is "one billion, three hundred twelve million, one hundred twenty-three thousand, four hundred twenty-nine".