77080109 has 2 divisors, whose sum is σ = 77080110. Its totient is φ = 77080108.

The previous prime is 77080103. The next prime is 77080111. The reversal of 77080109 is 90108077.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64048009 + 13032100 = 8003^2 + 3610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77080109 is a prime.

It is a Sophie Germain prime.

Together with 77080111, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77080103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38540054 + 38540055.

It is an arithmetic number, because the mean of its divisors is an integer number (38540055).

Almost surely, 2^77080109 is an apocalyptic number.

It is an amenable number.

77080109 is a deficient number, since it is larger than the sum of its proper divisors (1).

77080109 is an equidigital number, since it uses as much as digits as its factorization.

77080109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 32.

The square root of 77080109 is about 8779.5278346845. The cubic root of 77080109 is about 425.5795719091.

The spelling of 77080109 in words is "seventy-seven million, eighty thousand, one hundred nine".