309213426497 has 2 divisors, whose sum is σ = 309213426498. Its totient is φ = 309213426496.

The previous prime is 309213426469. The next prime is 309213426617. The reversal of 309213426497 is 794624312903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 298754069056 + 10459357441 = 546584^2 + 102271^2 .

It is an emirp because it is prime and its reverse (794624312903) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-309213426497 is a prime.

It is a super-2 number, since 2×309213426497² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (309215426497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154606713248 + 154606713249.

It is an arithmetic number, because the mean of its divisors is an integer number (154606713249).

Almost surely, 2^309213426497 is an apocalyptic number.

It is an amenable number.

309213426497 is a deficient number, since it is larger than the sum of its proper divisors (1).

309213426497 is an equidigital number, since it uses as much as digits as its factorization.

309213426497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1959552, while the sum is 50.

The spelling of 309213426497 in words is "three hundred nine billion, two hundred thirteen million, four hundred twenty-six thousand, four hundred ninety-seven".