121959165 has 8 divisors (see below), whose sum is σ = 195134688. Its totient is φ = 65044880.

The previous prime is 121959163. The next prime is 121959203. The reversal of 121959165 is 561959121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121959165 - 2¹ = 121959163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121959161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4065291 + ... + 4065320.

It is an arithmetic number, because the mean of its divisors is an integer number (24391836).

Almost surely, 2^121959165 is an apocalyptic number.

121959165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121959165 is a deficient number, since it is larger than the sum of its proper divisors (73175523).

121959165 is an equidigital number, since it uses as much as digits as its factorization.

121959165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8130619.

The product of its digits is 24300, while the sum is 39.

The square root of 121959165 is about 11043.5123488861. The cubic root of 121959165 is about 495.9122245929.

The spelling of 121959165 in words is "one hundred twenty-one million, nine hundred fifty-nine thousand, one hundred sixty-five".