121813185 has 16 divisors (see below), whose sum is σ = 209893824. Its totient is φ = 59969472.

The previous prime is 121813163. The next prime is 121813189. The reversal of 121813185 is 581318121.

It is not a de Polignac number, because 121813185 - 2⁷ = 121813057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121813189) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 312147 + ... + 312536.

It is an arithmetic number, because the mean of its divisors is an integer number (13118364).

Almost surely, 2^121813185 is an apocalyptic number.

121813185 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121813185 is a deficient number, since it is larger than the sum of its proper divisors (88080639).

121813185 is a wasteful number, since it uses less digits than its factorization.

121813185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624704.

The product of its digits is 1920, while the sum is 30.

The square root of 121813185 is about 11036.9010596272. The cubic root of 121813185 is about 495.7142835589.

The spelling of 121813185 in words is "one hundred twenty-one million, eight hundred thirteen thousand, one hundred eighty-five".