121591589 has 6 divisors (see below), whose sum is σ = 141443334. Its totient is φ = 104221320.

The previous prime is 121591567. The next prime is 121591619. The reversal of 121591589 is 985195121.

It can be written as a sum of positive squares in only one way, i.e., 117722500 + 3869089 = 10850^2 + 1967^2 .

It is not a de Polignac number, because 121591589 - 2⁸ = 121591333 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121591529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1240682 + ... + 1240779.

It is an arithmetic number, because the mean of its divisors is an integer number (23573889).

Almost surely, 2^121591589 is an apocalyptic number.

It is an amenable number.

121591589 is a deficient number, since it is larger than the sum of its proper divisors (19851745).

121591589 is an equidigital number, since it uses as much as digits as its factorization.

121591589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2481475 (or 2481468 counting only the distinct ones).

The product of its digits is 32400, while the sum is 41.

The square root of 121591589 is about 11026.8576212809. The cubic root of 121591589 is about 495.4135088390.

The spelling of 121591589 in words is "one hundred twenty-one million, five hundred ninety-one thousand, five hundred eighty-nine".