121789065 has 16 divisors (see below), whose sum is σ = 199616256. Its totient is φ = 63369600.

The previous prime is 121789061. The next prime is 121789081. The reversal of 121789065 is 560987121.

It is not a de Polignac number, because 121789065 - 2² = 121789061 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121789061) 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, 98401 + ... + 99630.

It is an arithmetic number, because the mean of its divisors is an integer number (12476016).

Almost surely, 2^121789065 is an apocalyptic number.

121789065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121789065 is a deficient number, since it is larger than the sum of its proper divisors (77827191).

121789065 is a wasteful number, since it uses less digits than its factorization.

121789065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198080.

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 121789065 is about 11035.8083075052. The cubic root of 121789065 is about 495.6815629144.

The spelling of 121789065 in words is "one hundred twenty-one million, seven hundred eighty-nine thousand, sixty-five".