1308105923909 has 2 divisors, whose sum is σ = 1308105923910. Its totient is φ = 1308105923908.

The previous prime is 1308105923903. The next prime is 1308105923921. The reversal of 1308105923909 is 9093295018031.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 903444547009 + 404661376900 = 950497^2 + 636130^2 .

It is a cyclic number.

It is not a de Polignac number, because 1308105923909 - 2²⁰ = 1308104875333 is a prime.

It is a super-2 number, since 2×1308105923909² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1308105923903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 654052961954 + 654052961955.

It is an arithmetic number, because the mean of its divisors is an integer number (654052961955).

Almost surely, 2^{1308105923909} is an apocalyptic number.

It is an amenable number.

1308105923909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1308105923909 is an equidigital number, since it uses as much as digits as its factorization.

1308105923909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 524880, while the sum is 50.

The spelling of 1308105923909 in words is "one trillion, three hundred eight billion, one hundred five million, nine hundred twenty-three thousand, nine hundred nine".