1312100109 has 12 divisors (see below), whose sum is σ = 1907977500. Its totient is φ = 868861824.

The previous prime is 1312100087. The next prime is 1312100117. The reversal of 1312100109 is 9010012131.

It can be written as a sum of positive squares in 2 ways, for example, as 188375625 + 1123724484 = 13725^2 + 33522^2 .

It is not a de Polignac number, because 1312100109 - 2⁵ = 1312100077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1312100091 and 1312100100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312100149) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 487884 + ... + 490565.

It is an arithmetic number, because the mean of its divisors is an integer number (158998125).

Almost surely, 2^1312100109 is an apocalyptic number.

It is an amenable number.

1312100109 is a deficient number, since it is larger than the sum of its proper divisors (595877391).

1312100109 is a wasteful number, since it uses less digits than its factorization.

1312100109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978604 (or 978601 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

The square root of 1312100109 is about 36222.9224248955. The cubic root of 1312100109 is about 1094.7685781032.

The spelling of 1312100109 in words is "one billion, three hundred twelve million, one hundred thousand, one hundred nine".