117661191 has 8 divisors (see below), whose sum is σ = 157348464. Its totient is φ = 78207360.

The previous prime is 117661189. The next prime is 117661211. The reversal of 117661191 is 191166711.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 117661191 - 2¹ = 117661189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117661111) 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 7 ways as a sum of consecutive naturals, for example, 57180 + ... + 59201.

It is an arithmetic number, because the mean of its divisors is an integer number (19668558).

Almost surely, 2^117661191 is an apocalyptic number.

117661191 is a deficient number, since it is larger than the sum of its proper divisors (39687273).

117661191 is a wasteful number, since it uses less digits than its factorization.

117661191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116721.

The product of its digits is 2268, while the sum is 33.

The square root of 117661191 is about 10847.1743325163. The cubic root of 117661191 is about 490.0169243078.

The spelling of 117661191 in words is "one hundred seventeen million, six hundred sixty-one thousand, one hundred ninety-one".