121544393 has 2 divisors, whose sum is σ = 121544394. Its totient is φ = 121544392.

The previous prime is 121544383. The next prime is 121544411. The reversal of 121544393 is 393445121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116035984 + 5508409 = 10772^2 + 2347^2 .

It is an emirp because it is prime and its reverse (393445121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121544393 - 2¹⁰ = 121543369 is a prime.

It is not a weakly prime, because it can be changed into another prime (121544333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60772196 + 60772197.

It is an arithmetic number, because the mean of its divisors is an integer number (60772197).

Almost surely, 2^121544393 is an apocalyptic number.

It is an amenable number.

121544393 is a deficient number, since it is larger than the sum of its proper divisors (1).

121544393 is an equidigital number, since it uses as much as digits as its factorization.

121544393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 32.

The square root of 121544393 is about 11024.7173659917. The cubic root of 121544393 is about 495.3494019875.

The spelling of 121544393 in words is "one hundred twenty-one million, five hundred forty-four thousand, three hundred ninety-three".