117781671 has 24 divisors (see below), whose sum is σ = 183448960. Its totient is φ = 65845872.

The previous prime is 117781663. The next prime is 117781691. The reversal of 117781671 is 176187711.

It is not a de Polignac number, because 117781671 - 2³ = 117781663 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 (117781691) 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 23 ways as a sum of consecutive naturals, for example, 45120 + ... + 47658.

Almost surely, 2^117781671 is an apocalyptic number.

117781671 is a deficient number, since it is larger than the sum of its proper divisors (65667289).

117781671 is an equidigital number, since it uses as much as digits as its factorization.

117781671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2643 (or 2596 counting only the distinct ones).

The product of its digits is 16464, while the sum is 39.

The square root of 117781671 is about 10852.7264316392. The cubic root of 117781671 is about 490.1841193404.

The spelling of 117781671 in words is "one hundred seventeen million, seven hundred eighty-one thousand, six hundred seventy-one".