121543397 has 2 divisors, whose sum is σ = 121543398. Its totient is φ = 121543396.

The previous prime is 121543391. The next prime is 121543403. The reversal of 121543397 is 793345121.

It is a balanced prime because it is at equal distance from previous prime (121543391) and next prime (121543403).

It can be written as a sum of positive squares in only one way, i.e., 110481121 + 11062276 = 10511^2 + 3326^2 .

It is a cyclic number.

It is not a de Polignac number, because 121543397 - 2²⁶ = 54434533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121543391) 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, 60771698 + 60771699.

It is an arithmetic number, because the mean of its divisors is an integer number (60771699).

Almost surely, 2^121543397 is an apocalyptic number.

It is an amenable number.

121543397 is a deficient number, since it is larger than the sum of its proper divisors (1).

121543397 is an equidigital number, since it uses as much as digits as its factorization.

121543397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 35.

The square root of 121543397 is about 11024.6721946732. The cubic root of 121543397 is about 495.3480489308.

It can be divided in two parts, 12154 and 3397, that added together give a palindrome (15551).

The spelling of 121543397 in words is "one hundred twenty-one million, five hundred forty-three thousand, three hundred ninety-seven".