117777909 has 4 divisors (see below), whose sum is σ = 157037216. Its totient is φ = 78518604.

The previous prime is 117777901. The next prime is 117777931. The reversal of 117777909 is 909777711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 117777909 - 2³ = 117777901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117777901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19629649 + ... + 19629654.

It is an arithmetic number, because the mean of its divisors is an integer number (39259304).

Almost surely, 2^117777909 is an apocalyptic number.

It is an amenable number.

117777909 is a deficient number, since it is larger than the sum of its proper divisors (39259307).

117777909 is an equidigital number, since it uses as much as digits as its factorization.

117777909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39259306.

The product of its (nonzero) digits is 194481, while the sum is 48.

The square root of 117777909 is about 10852.5531097526. The cubic root of 117777909 is about 490.1789003837.

The spelling of 117777909 in words is "one hundred seventeen million, seven hundred seventy-seven thousand, nine hundred nine".