309383129873 has 2 divisors, whose sum is σ = 309383129874. Its totient is φ = 309383129872.

The previous prime is 309383129857. The next prime is 309383129953. The reversal of 309383129873 is 378921383903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182031929104 + 127351200769 = 426652^2 + 356863^2 .

It is an emirp because it is prime and its reverse (378921383903) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 309383129873 - 2⁴ = 309383129857 is a prime.

It is a super-2 number, since 2×309383129873² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (309383129833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154691564936 + 154691564937.

It is an arithmetic number, because the mean of its divisors is an integer number (154691564937).

Almost surely, 2^309383129873 is an apocalyptic number.

It is an amenable number.

309383129873 is a deficient number, since it is larger than the sum of its proper divisors (1).

309383129873 is an equidigital number, since it uses as much as digits as its factorization.

309383129873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5878656, while the sum is 56.

The spelling of 309383129873 in words is "three hundred nine billion, three hundred eighty-three million, one hundred twenty-nine thousand, eight hundred seventy-three".