676156309 has 2 divisors, whose sum is σ = 676156310. Its totient is φ = 676156308.

The previous prime is 676156307. The next prime is 676156319. The reversal of 676156309 is 903651676.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 628504900 + 47651409 = 25070^2 + 6903^2 .

It is a cyclic number.

It is not a de Polignac number, because 676156309 - 2¹ = 676156307 is a prime.

Together with 676156307, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (676156301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 338078154 + 338078155.

It is an arithmetic number, because the mean of its divisors is an integer number (338078155).

Almost surely, 2^676156309 is an apocalyptic number.

It is an amenable number.

676156309 is a deficient number, since it is larger than the sum of its proper divisors (1).

676156309 is an equidigital number, since it uses as much as digits as its factorization.

676156309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 43.

The square root of 676156309 is about 26003.0057685645. The cubic root of 676156309 is about 877.7059346810.

The spelling of 676156309 in words is "six hundred seventy-six million, one hundred fifty-six thousand, three hundred nine".