185220117 has 24 divisors (see below), whose sum is σ = 284416704. Its totient is φ = 115749504.

The previous prime is 185220089. The next prime is 185220121. The reversal of 185220117 is 711022581.

It is not a de Polignac number, because 185220117 - 2¹⁹ = 184695829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (185220197) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37938 + ... + 42540.

It is an arithmetic number, because the mean of its divisors is an integer number (11850696).

Almost surely, 2^185220117 is an apocalyptic number.

185220117 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

185220117 is a deficient number, since it is larger than the sum of its proper divisors (99196587).

185220117 is a wasteful number, since it uses less digits than its factorization.

185220117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4889 (or 4886 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 185220117 is about 13609.5597651063. The cubic root of 185220117 is about 570.0278195102.

Adding to 185220117 its reverse (711022581), we get a palindrome (896242698).

The spelling of 185220117 in words is "one hundred eighty-five million, two hundred twenty thousand, one hundred seventeen".