117787161 has 4 divisors (see below), whose sum is σ = 157049552. Its totient is φ = 78524772.

The previous prime is 117787141. The next prime is 117787193. The reversal of 117787161 is 161787711.

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 117787161 - 2¹⁴ = 117770777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (117787141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19631191 + ... + 19631196.

It is an arithmetic number, because the mean of its divisors is an integer number (39262388).

Almost surely, 2^117787161 is an apocalyptic number.

It is an amenable number.

117787161 is a deficient number, since it is larger than the sum of its proper divisors (39262391).

117787161 is an equidigital number, since it uses as much as digits as its factorization.

117787161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39262390.

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

The square root of 117787161 is about 10852.9793605258. The cubic root of 117787161 is about 490.1917353216.

The spelling of 117787161 in words is "one hundred seventeen million, seven hundred eighty-seven thousand, one hundred sixty-one".