121920589 has 4 divisors (see below), whose sum is σ = 139337824. Its totient is φ = 104503356.

The previous prime is 121920569. The next prime is 121920599. The reversal of 121920589 is 985029121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121920589 - 2¹⁷ = 121789517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121920529) 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 3 ways as a sum of consecutive naturals, for example, 8708607 + ... + 8708620.

It is an arithmetic number, because the mean of its divisors is an integer number (34834456).

Almost surely, 2^121920589 is an apocalyptic number.

It is an amenable number.

121920589 is a deficient number, since it is larger than the sum of its proper divisors (17417235).

121920589 is an equidigital number, since it uses as much as digits as its factorization.

121920589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17417234.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 121920589 is about 11041.7656649650. The cubic root of 121920589 is about 495.8599329719.

The spelling of 121920589 in words is "one hundred twenty-one million, nine hundred twenty thousand, five hundred eighty-nine".