121813165 has 4 divisors (see below), whose sum is σ = 146175804. Its totient is φ = 97450528.

The previous prime is 121813163. The next prime is 121813189. The reversal of 121813165 is 561318121.

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 41190724 + 80622441 = 6418^2 + 8979^2 .

It is a cyclic number.

It is not a de Polignac number, because 121813165 - 2¹ = 121813163 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121813163) 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, 12181312 + ... + 12181321.

It is an arithmetic number, because the mean of its divisors is an integer number (36543951).

Almost surely, 2^121813165 is an apocalyptic number.

It is an amenable number.

121813165 is a deficient number, since it is larger than the sum of its proper divisors (24362639).

121813165 is an equidigital number, since it uses as much as digits as its factorization.

121813165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24362638.

The product of its digits is 1440, while the sum is 28.

The square root of 121813165 is about 11036.9001535757. The cubic root of 121813165 is about 495.7142564292.

The spelling of 121813165 in words is "one hundred twenty-one million, eight hundred thirteen thousand, one hundred sixty-five".