121669811 has 2 divisors, whose sum is σ = 121669812. Its totient is φ = 121669810.

The previous prime is 121669777. The next prime is 121669813. The reversal of 121669811 is 118966121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121669811 is a prime.

Together with 121669813, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121669813) 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, 60834905 + 60834906.

It is an arithmetic number, because the mean of its divisors is an integer number (60834906).

Almost surely, 2^121669811 is an apocalyptic number.

121669811 is a deficient number, since it is larger than the sum of its proper divisors (1).

121669811 is an equidigital number, since it uses as much as digits as its factorization.

121669811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 35.

The square root of 121669811 is about 11030.4039363933. The cubic root of 121669811 is about 495.5197221299.

The spelling of 121669811 in words is "one hundred twenty-one million, six hundred sixty-nine thousand, eight hundred eleven".