121899389 has 2 divisors, whose sum is σ = 121899390. Its totient is φ = 121899388.

The previous prime is 121899377. The next prime is 121899419. The reversal of 121899389 is 983998121.

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., 121771225 + 128164 = 11035^2 + 358^2 .

It is a cyclic number.

It is not a de Polignac number, because 121899389 - 2¹⁶ = 121833853 is a prime.

It is a super-2 number, since 2×121899389² = 29718922077146642, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121899319) 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, 60949694 + 60949695.

It is an arithmetic number, because the mean of its divisors is an integer number (60949695).

Almost surely, 2^121899389 is an apocalyptic number.

It is an amenable number.

121899389 is a deficient number, since it is larger than the sum of its proper divisors (1).

121899389 is an equidigital number, since it uses as much as digits as its factorization.

121899389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 50.

The square root of 121899389 is about 11040.8056318368. The cubic root of 121899389 is about 495.8311906568.

The spelling of 121899389 in words is "one hundred twenty-one million, eight hundred ninety-nine thousand, three hundred eighty-nine".