117657409 has 3 divisors (see below), whose sum is σ = 117668257. Its totient is φ = 117646562.

The previous prime is 117657401. The next prime is 117657451. The reversal of 117657409 is 904756711.

The square root of 117657409 is 10847.

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: 904756711 = 17 ⋅53220983.

It is not a de Polignac number, because 117657409 - 2³ = 117657401 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117657401) 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, 5424 + ... + 16270.

Almost surely, 2^117657409 is an apocalyptic number.

117657409 is the 10847-th square number.

117657409 is the 5424-th centered octagonal number.

It is an amenable number.

117657409 is a deficient number, since it is larger than the sum of its proper divisors (10848).

117657409 is an frugal number, since it uses more digits than its factorization.

117657409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21694 (or 10847 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 40.

The cubic root of 117657409 is about 490.0116740242.

It can be divided in two parts, 1176 and 57409, that added together give a palindrome (58585).

The spelling of 117657409 in words is "one hundred seventeen million, six hundred fifty-seven thousand, four hundred nine".