121858589 has 2 divisors, whose sum is σ = 121858590. Its totient is φ = 121858588.

The previous prime is 121858549. The next prime is 121858631. The reversal of 121858589 is 985858121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113592964 + 8265625 = 10658^2 + 2875^2 .

It is an emirp because it is prime and its reverse (985858121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121858589 - 2⁸ = 121858333 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121858549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60929294 + 60929295.

It is an arithmetic number, because the mean of its divisors is an integer number (60929295).

Almost surely, 2^121858589 is an apocalyptic number.

It is an amenable number.

121858589 is a deficient number, since it is larger than the sum of its proper divisors (1).

121858589 is an equidigital number, since it uses as much as digits as its factorization.

121858589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 230400, while the sum is 47.

The square root of 121858589 is about 11038.9577859506. The cubic root of 121858589 is about 495.7758658786.

The spelling of 121858589 in words is "one hundred twenty-one million, eight hundred fifty-eight thousand, five hundred eighty-nine".