309727909697 has 4 divisors (see below), whose sum is σ = 313207998660. Its totient is φ = 306247820736.

The previous prime is 309727909691. The next prime is 309727909703. The reversal of 309727909697 is 796909727903.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 796909727903 = 199 ⋅4004571497.

It is an interprime number because it is at equal distance from previous prime (309727909691) and next prime (309727909703).

It can be written as a sum of positive squares in 2 ways, for example, as 109087520656 + 200640389041 = 330284^2 + 447929^2 .

It is a cyclic number.

It is not a de Polignac number, because 309727909697 - 2⁸ = 309727909441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (309727909691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1740044348 + ... + 1740044525.

It is an arithmetic number, because the mean of its divisors is an integer number (78301999665).

Almost surely, 2^309727909697 is an apocalyptic number.

It is an amenable number.

309727909697 is a deficient number, since it is larger than the sum of its proper divisors (3480088963).

309727909697 is an equidigital number, since it uses as much as digits as its factorization.

309727909697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3480088962.

The product of its (nonzero) digits is 81015228, while the sum is 68.

The spelling of 309727909697 in words is "three hundred nine billion, seven hundred twenty-seven million, nine hundred nine thousand, six hundred ninety-seven".