121869845 has 6 divisors (see below), whose sum is σ = 146273442. Its totient is φ = 97476128.

The previous prime is 121869841. The next prime is 121869859. The reversal of 121869845 is 548968121.

It can be written as a sum of positive squares in 3 ways, for example, as 7828804 + 114041041 = 2798^2 + 10679^2 .

It is not a de Polignac number, because 121869845 - 2² = 121869841 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121869796 and 121869805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121869841) 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 5 ways as a sum of consecutive naturals, for example, 22217 + ... + 27153.

It is an arithmetic number, because the mean of its divisors is an integer number (24378907).

Almost surely, 2^121869845 is an apocalyptic number.

It is an amenable number.

121869845 is a deficient number, since it is larger than the sum of its proper divisors (24403597).

121869845 is an frugal number, since it uses more digits than its factorization.

121869845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9879 (or 4942 counting only the distinct ones).

The product of its digits is 138240, while the sum is 44.

The square root of 121869845 is about 11039.4676049165. The cubic root of 121869845 is about 495.7911302419.

The spelling of 121869845 in words is "one hundred twenty-one million, eight hundred sixty-nine thousand, eight hundred forty-five".