1312123009 has 8 divisors (see below), whose sum is σ = 1362657960. Its totient is φ = 1261940736.

The previous prime is 1312122983. The next prime is 1312123061. The reversal of 1312123009 is 9003212131.

It can be written as a sum of positive squares in 4 ways, for example, as 782432784 + 529690225 = 27972^2 + 23015^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1312123009 - 2¹⁷ = 1311991937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312123069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80574 + ... + 95479.

It is an arithmetic number, because the mean of its divisors is an integer number (170332245).

Almost surely, 2^1312123009 is an apocalyptic number.

It is an amenable number.

1312123009 is a deficient number, since it is larger than the sum of its proper divisors (50534951).

1312123009 is a wasteful number, since it uses less digits than its factorization.

1312123009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176339.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 1312123009 is about 36223.2385217004. The cubic root of 1312123009 is about 1094.7749470417.

The spelling of 1312123009 in words is "one billion, three hundred twelve million, one hundred twenty-three thousand, nine".