121351689 has 40 divisors (see below), whose sum is σ = 197472000. Its totient is φ = 73973088.

The previous prime is 121351669. The next prime is 121351733. The reversal of 121351689 is 986153121.

It is not a de Polignac number, because 121351689 - 2⁹ = 121351177 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121351649) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 43272 + ... + 45990.

It is an arithmetic number, because the mean of its divisors is an integer number (4936800).

Almost surely, 2^121351689 is an apocalyptic number.

121351689 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

121351689 is a deficient number, since it is larger than the sum of its proper divisors (76120311).

121351689 is a wasteful number, since it uses less digits than its factorization.

121351689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2779 (or 2770 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 121351689 is about 11015.9742646758. The cubic root of 121351689 is about 495.0874776528.

It can be divided in two parts, 12135 and 1689, that added together give a cube (13824 = 24³).

The spelling of 121351689 in words is "one hundred twenty-one million, three hundred fifty-one thousand, six hundred eighty-nine".