117779999 has 2 divisors, whose sum is σ = 117780000. Its totient is φ = 117779998.

The previous prime is 117779971. The next prime is 117780007. The reversal of 117779999 is 999977711.

It is a strong prime.

It is an emirp because it is prime and its reverse (999977711) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117779999 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117779899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58889999 + 58890000.

It is an arithmetic number, because the mean of its divisors is an integer number (58890000).

Almost surely, 2^117779999 is an apocalyptic number.

117779999 is a deficient number, since it is larger than the sum of its proper divisors (1).

117779999 is an equidigital number, since it uses as much as digits as its factorization.

117779999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2250423, while the sum is 59.

The square root of 117779999 is about 10852.6494000313. The cubic root of 117779999 is about 490.1817998178.

The spelling of 117779999 in words is "one hundred seventeen million, seven hundred seventy-nine thousand, nine hundred ninety-nine".