117997181 has 8 divisors (see below), whose sum is σ = 121667640. Its totient is φ = 114352128.

The previous prime is 117997177. The next prime is 117997193. The reversal of 117997181 is 181799711.

It can be written as a sum of positive squares in 4 ways, for example, as 42133081 + 75864100 = 6491^2 + 8710^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 117997181 - 2² = 117997177 is a prime.

It is a super-2 number, since 2×117997181² = 27846669447893522, 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 (117997151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3305 + ... + 15713.

It is an arithmetic number, because the mean of its divisors is an integer number (15208455).

Almost surely, 2^117997181 is an apocalyptic number.

It is an amenable number.

117997181 is a deficient number, since it is larger than the sum of its proper divisors (3670459).

117997181 is a wasteful number, since it uses less digits than its factorization.

117997181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12703.

The product of its digits is 31752, while the sum is 44.

The square root of 117997181 is about 10862.6507354329. The cubic root of 117997181 is about 490.4829072390.

The spelling of 117997181 in words is "one hundred seventeen million, nine hundred ninety-seven thousand, one hundred eighty-one".