121999489 has 2 divisors, whose sum is σ = 121999490. Its totient is φ = 121999488.

The previous prime is 121999457. The next prime is 121999517. The reversal of 121999489 is 984999121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97911025 + 24088464 = 9895^2 + 4908^2 .

It is a cyclic number.

It is not a de Polignac number, because 121999489 - 2⁵ = 121999457 is a prime.

It is a super-2 number, since 2×121999489² = 29767750632522242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121999789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60999744 + 60999745.

It is an arithmetic number, because the mean of its divisors is an integer number (60999745).

Almost surely, 2^121999489 is an apocalyptic number.

It is an amenable number.

121999489 is a deficient number, since it is larger than the sum of its proper divisors (1).

121999489 is an equidigital number, since it uses as much as digits as its factorization.

121999489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 52.

The square root of 121999489 is about 11045.3378852799. The cubic root of 121999489 is about 495.9668739258.

The spelling of 121999489 in words is "one hundred twenty-one million, nine hundred ninety-nine thousand, four hundred eighty-nine".