121999453 has 2 divisors, whose sum is σ = 121999454. Its totient is φ = 121999452.

The previous prime is 121999441. The next prime is 121999457. The reversal of 121999453 is 354999121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107391769 + 14607684 = 10363^2 + 3822^2 .

It is a cyclic number.

It is not a de Polignac number, because 121999453 - 2⁹ = 121998941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121999457) 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, 60999726 + 60999727.

It is an arithmetic number, because the mean of its divisors is an integer number (60999727).

Almost surely, 2^121999453 is an apocalyptic number.

It is an amenable number.

121999453 is a deficient number, since it is larger than the sum of its proper divisors (1).

121999453 is an equidigital number, since it uses as much as digits as its factorization.

121999453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87480, while the sum is 43.

The square root of 121999453 is about 11045.3362556330. The cubic root of 121999453 is about 495.9668251420.

The spelling of 121999453 in words is "one hundred twenty-one million, nine hundred ninety-nine thousand, four hundred fifty-three".