677821099 has 2 divisors, whose sum is σ = 677821100. Its totient is φ = 677821098.

The previous prime is 677821097. The next prime is 677821163. The reversal of 677821099 is 990128776.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 677821099 - 2¹ = 677821097 is a prime.

Together with 677821097, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (677821097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 338910549 + 338910550.

It is an arithmetic number, because the mean of its divisors is an integer number (338910550).

Almost surely, 2^677821099 is an apocalyptic number.

677821099 is a deficient number, since it is larger than the sum of its proper divisors (1).

677821099 is an equidigital number, since it uses as much as digits as its factorization.

677821099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 49.

The square root of 677821099 is about 26034.9975801804. The cubic root of 677821099 is about 878.4256886093.

The spelling of 677821099 in words is "six hundred seventy-seven million, eight hundred twenty-one thousand, ninety-nine".