117787609 has 3 divisors (see below), whose sum is σ = 117798463. Its totient is φ = 117776756.

The previous prime is 117787603. The next prime is 117787619. The reversal of 117787609 is 906787711.

The square root of 117787609 is 10853.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 906787711 = 19 ⋅47725669.

It can be written as a sum of positive squares in only one way, i.e., 63441225 + 54346384 = 7965^2 + 7372^2 .

It is not a de Polignac number, because 117787609 - 2³ = 117787601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117787601) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5427 + ... + 16279.

Almost surely, 2^117787609 is an apocalyptic number.

117787609 is the 10853-rd square number.

117787609 is the 5427-th centered octagonal number.

It is an amenable number.

117787609 is a deficient number, since it is larger than the sum of its proper divisors (10854).

117787609 is an frugal number, since it uses more digits than its factorization.

117787609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21706 (or 10853 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 46.

The cubic root of 117787609 is about 490.1923567975.

The spelling of 117787609 in words is "one hundred seventeen million, seven hundred eighty-seven thousand, six hundred nine".