121386889 has 8 divisors (see below), whose sum is σ = 132868232. Its totient is φ = 110211840.

The previous prime is 121386887. The next prime is 121386901. The reversal of 121386889 is 988683121.

It can be written as a sum of positive squares in 4 ways, for example, as 8602489 + 112784400 = 2933^2 + 10620^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121386889 - 2¹ = 121386887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121386883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75744 + ... + 77329.

It is an arithmetic number, because the mean of its divisors is an integer number (16608529).

Almost surely, 2^121386889 is an apocalyptic number.

It is an amenable number.

121386889 is a deficient number, since it is larger than the sum of its proper divisors (11481343).

121386889 is a wasteful number, since it uses less digits than its factorization.

121386889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153147.

The product of its digits is 165888, while the sum is 46.

The square root of 121386889 is about 11017.5718286744. The cubic root of 121386889 is about 495.1353423745.

The spelling of 121386889 in words is "one hundred twenty-one million, three hundred eighty-six thousand, eight hundred eighty-nine".