77099999 has 2 divisors, whose sum is σ = 77100000. Its totient is φ = 77099998.

The previous prime is 77099993. The next prime is 77100017. The reversal of 77099999 is 99999077.

It is a weak prime.

It is an emirp because it is prime and its reverse (99999077) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77099999 - 2⁴ = 77099983 is a prime.

It is a Sophie Germain prime.

77099999 is a modest number, since divided by 9999 gives 7709 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77099993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38549999 + 38550000.

It is an arithmetic number, because the mean of its divisors is an integer number (38550000).

Almost surely, 2^77099999 is an apocalyptic number.

77099999 is a deficient number, since it is larger than the sum of its proper divisors (1).

77099999 is an equidigital number, since it uses as much as digits as its factorization.

77099999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2893401, while the sum is 59.

The square root of 77099999 is about 8780.6605104628. The cubic root of 77099999 is about 425.6161747361.

The spelling of 77099999 in words is "seventy-seven million, ninety-nine thousand, nine hundred ninety-nine".