121797393 has 4 divisors (see below), whose sum is σ = 162396528. Its totient is φ = 81198260.

The previous prime is 121797383. The next prime is 121797407. The reversal of 121797393 is 393797121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 393797121 = 3 ⋅131265707.

It is a cyclic number.

It is not a de Polignac number, because 121797393 - 2²¹ = 119700241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121797383) 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 in 3 ways as a sum of consecutive naturals, for example, 20299563 + ... + 20299568.

It is an arithmetic number, because the mean of its divisors is an integer number (40599132).

Almost surely, 2^121797393 is an apocalyptic number.

It is an amenable number.

121797393 is a deficient number, since it is larger than the sum of its proper divisors (40599135).

121797393 is an equidigital number, since it uses as much as digits as its factorization.

121797393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40599134.

The product of its digits is 71442, while the sum is 42.

The square root of 121797393 is about 11036.1856182288. The cubic root of 121797393 is about 495.6928609784.

The spelling of 121797393 in words is "one hundred twenty-one million, seven hundred ninety-seven thousand, three hundred ninety-three".