117781669 has 4 divisors (see below), whose sum is σ = 118572300. Its totient is φ = 116991040.

The previous prime is 117781663. The next prime is 117781691. The reversal of 117781669 is 966187711.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66830625 + 50951044 = 8175^2 + 7138^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117781669 is a prime.

It is a super-2 number, since 2×117781669² = 27745043104851122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117781663) 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, 395092 + ... + 395389.

It is an arithmetic number, because the mean of its divisors is an integer number (29643075).

Almost surely, 2^117781669 is an apocalyptic number.

It is an amenable number.

117781669 is a deficient number, since it is larger than the sum of its proper divisors (790631).

117781669 is an equidigital number, since it uses as much as digits as its factorization.

117781669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790630.

The product of its digits is 127008, while the sum is 46.

The square root of 117781669 is about 10852.7263394964. The cubic root of 117781669 is about 490.1841165658.

The spelling of 117781669 in words is "one hundred seventeen million, seven hundred eighty-one thousand, six hundred sixty-nine".