676400909 has 2 divisors, whose sum is σ = 676400910. Its totient is φ = 676400908.

The previous prime is 676400899. The next prime is 676400911. The reversal of 676400909 is 909004676.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 427455625 + 248945284 = 20675^2 + 15778^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-676400909 is a prime.

Together with 676400911, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (676400929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 338200454 + 338200455.

It is an arithmetic number, because the mean of its divisors is an integer number (338200455).

Almost surely, 2^676400909 is an apocalyptic number.

It is an amenable number.

676400909 is a deficient number, since it is larger than the sum of its proper divisors (1).

676400909 is an equidigital number, since it uses as much as digits as its factorization.

676400909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 676400909 is about 26007.7086457073. The cubic root of 676400909 is about 877.8117588256.

The spelling of 676400909 in words is "six hundred seventy-six million, four hundred thousand, nine hundred nine".