1312409849 has 2 divisors, whose sum is σ = 1312409850. Its totient is φ = 1312409848.

The previous prime is 1312409827. The next prime is 1312409887. The reversal of 1312409849 is 9489042131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1310802025 + 1607824 = 36205^2 + 1268^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312409849 is a prime.

It is a super-3 number, since 3×1312409849³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (1312409899) 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 as a sum of consecutive naturals, namely, 656204924 + 656204925.

It is an arithmetic number, because the mean of its divisors is an integer number (656204925).

Almost surely, 2^1312409849 is an apocalyptic number.

It is an amenable number.

1312409849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312409849 is an equidigital number, since it uses as much as digits as its factorization.

1312409849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 1312409849 is about 36227.1976421031. The cubic root of 1312409849 is about 1094.8547165866.

The spelling of 1312409849 in words is "one billion, three hundred twelve million, four hundred nine thousand, eight hundred forty-nine".