121898489 has 2 divisors, whose sum is σ = 121898490. Its totient is φ = 121898488.

The previous prime is 121898443. The next prime is 121898503. The reversal of 121898489 is 984898121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120121600 + 1776889 = 10960^2 + 1333^2 .

It is an emirp because it is prime and its reverse (984898121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121898489 - 2²⁴ = 105121273 is a prime.

It is not a weakly prime, because it can be changed into another prime (121898419) 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 as a sum of consecutive naturals, namely, 60949244 + 60949245.

It is an arithmetic number, because the mean of its divisors is an integer number (60949245).

Almost surely, 2^121898489 is an apocalyptic number.

It is an amenable number.

121898489 is a deficient number, since it is larger than the sum of its proper divisors (1).

121898489 is an equidigital number, since it uses as much as digits as its factorization.

121898489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 331776, while the sum is 50.

The square root of 121898489 is about 11040.7648738663. The cubic root of 121898489 is about 495.8299703905.

The spelling of 121898489 in words is "one hundred twenty-one million, eight hundred ninety-eight thousand, four hundred eighty-nine".