121643611 has 2 divisors, whose sum is σ = 121643612. Its totient is φ = 121643610.

The previous prime is 121643593. The next prime is 121643629. The reversal of 121643611 is 116346121.

It is a balanced prime because it is at equal distance from previous prime (121643593) and next prime (121643629).

It is a cyclic number.

It is not a de Polignac number, because 121643611 - 2⁹ = 121643099 is a prime.

It is not a weakly prime, because it can be changed into another prime (121643651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60821805 + 60821806.

It is an arithmetic number, because the mean of its divisors is an integer number (60821806).

Almost surely, 2^121643611 is an apocalyptic number.

121643611 is a deficient number, since it is larger than the sum of its proper divisors (1).

121643611 is an equidigital number, since it uses as much as digits as its factorization.

121643611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 25.

The square root of 121643611 is about 11029.2162459533. The cubic root of 121643611 is about 495.4841516829.

Adding to 121643611 its reverse (116346121), we get a palindrome (237989732).

The spelling of 121643611 in words is "one hundred twenty-one million, six hundred forty-three thousand, six hundred eleven".