117900181 has 4 divisors (see below), whose sum is σ = 134743072. Its totient is φ = 101057292.

The previous prime is 117900173. The next prime is 117900191. The reversal of 117900181 is 181009711.

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 117900181 - 2³ = 117900173 is a prime.

It is a super-2 number, since 2×117900181² = 27800905359665522, 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 (117900121) 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, 8421435 + ... + 8421448.

It is an arithmetic number, because the mean of its divisors is an integer number (33685768).

Almost surely, 2^117900181 is an apocalyptic number.

It is an amenable number.

117900181 is a deficient number, since it is larger than the sum of its proper divisors (16842891).

117900181 is an equidigital number, since it uses as much as digits as its factorization.

117900181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16842890.

The product of its (nonzero) digits is 504, while the sum is 28.

The square root of 117900181 is about 10858.1849772418. The cubic root of 117900181 is about 490.3484693243.

Adding to 117900181 its reverse (181009711), we get a palindrome (298909892).

The spelling of 117900181 in words is "one hundred seventeen million, nine hundred thousand, one hundred eighty-one".