121928165 has 16 divisors (see below), whose sum is σ = 155254320. Its totient is φ = 91607040.

The previous prime is 121928123. The next prime is 121928171. The reversal of 121928165 is 561829121.

It can be written as a sum of positive squares in 8 ways, for example, as 26553409 + 95374756 = 5153^2 + 9766^2 .

It is not a de Polignac number, because 121928165 - 2⁶ = 121928101 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47105 + ... + 49625.

It is an arithmetic number, because the mean of its divisors is an integer number (9703395).

Almost surely, 2^121928165 is an apocalyptic number.

It is an amenable number.

121928165 is a deficient number, since it is larger than the sum of its proper divisors (33326155).

121928165 is a wasteful number, since it uses less digits than its factorization.

121928165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3112.

The product of its digits is 8640, while the sum is 35.

The square root of 121928165 is about 11042.1087207109. The cubic root of 121928165 is about 495.8702034741.

The spelling of 121928165 in words is "one hundred twenty-one million, nine hundred twenty-eight thousand, one hundred sixty-five".