121789965 has 16 divisors (see below), whose sum is σ = 212579136. Its totient is φ = 59049600.

The previous prime is 121789963. The next prime is 121789973. The reversal of 121789965 is 569987121.

It is not a de Polignac number, because 121789965 - 2¹ = 121789963 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121789961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 368896 + ... + 369225.

It is an arithmetic number, because the mean of its divisors is an integer number (13286196).

Almost surely, 2^121789965 is an apocalyptic number.

121789965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121789965 is a deficient number, since it is larger than the sum of its proper divisors (90789171).

121789965 is a wasteful number, since it uses less digits than its factorization.

121789965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738140.

The product of its digits is 272160, while the sum is 48.

The square root of 121789965 is about 11035.8490837815. The cubic root of 121789965 is about 495.6827839116.

The spelling of 121789965 in words is "one hundred twenty-one million, seven hundred eighty-nine thousand, nine hundred sixty-five".