117991849 has 4 divisors (see below), whose sum is σ = 124932564. Its totient is φ = 111051136.

The previous prime is 117991777. The next prime is 117991879. The reversal of 117991849 is 948199711.

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 49632025 + 68359824 = 7045^2 + 8268^2 .

It is a cyclic number.

It is not a de Polignac number, because 117991849 - 2¹⁹ = 117467561 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117991879) 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, 3470332 + ... + 3470365.

It is an arithmetic number, because the mean of its divisors is an integer number (31233141).

Almost surely, 2^117991849 is an apocalyptic number.

It is an amenable number.

117991849 is a deficient number, since it is larger than the sum of its proper divisors (6940715).

117991849 is an equidigital number, since it uses as much as digits as its factorization.

117991849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6940714.

The product of its digits is 163296, while the sum is 49.

The square root of 117991849 is about 10862.4053045355. The cubic root of 117991849 is about 490.4755192256.

The spelling of 117991849 in words is "one hundred seventeen million, nine hundred ninety-one thousand, eight hundred forty-nine".