117777771 has 12 divisors (see below), whose sum is σ = 174721872. Its totient is φ = 76396176.

The previous prime is 117777767. The next prime is 117777791. The reversal of 117777771 is 177777711.

It is not a de Polignac number, because 117777771 - 2² = 117777767 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (117777721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 176511 + ... + 177176.

It is an arithmetic number, because the mean of its divisors is an integer number (14560156).

Almost surely, 2^117777771 is an apocalyptic number.

117777771 is a deficient number, since it is larger than the sum of its proper divisors (56944101).

117777771 is a wasteful number, since it uses less digits than its factorization.

117777771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353730 (or 353727 counting only the distinct ones).

The product of its digits is 117649, while the sum is 45.

The square root of 117777771 is about 10852.5467517998. The cubic root of 117777771 is about 490.1787089367.

The spelling of 117777771 in words is "one hundred seventeen million, seven hundred seventy-seven thousand, seven hundred seventy-one".