121386165 has 32 divisors (see below), whose sum is σ = 199221120. Its totient is φ = 63088896.

The previous prime is 121386131. The next prime is 121386179. The reversal of 121386165 is 561683121.

It is not a de Polignac number, because 121386165 - 2⁹ = 121385653 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 141879 + ... + 142731.

It is an arithmetic number, because the mean of its divisors is an integer number (6225660).

Almost surely, 2^121386165 is an apocalyptic number.

121386165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121386165 is a deficient number, since it is larger than the sum of its proper divisors (77834955).

121386165 is a wasteful number, since it uses less digits than its factorization.

121386165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1093.

The product of its digits is 8640, while the sum is 33.

The square root of 121386165 is about 11017.5389720209. The cubic root of 121386165 is about 495.1343579774.

It can be divided in two parts, 1213 and 86165, that added together give a palindrome (87378).

The spelling of 121386165 in words is "one hundred twenty-one million, three hundred eighty-six thousand, one hundred sixty-five".