121233809 has 2 divisors, whose sum is σ = 121233810. Its totient is φ = 121233808.

The previous prime is 121233803. The next prime is 121233811. The reversal of 121233809 is 908332121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104448400 + 16785409 = 10220^2 + 4097^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121233809 is a prime.

Together with 121233811, 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 (121233803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60616904 + 60616905.

It is an arithmetic number, because the mean of its divisors is an integer number (60616905).

Almost surely, 2^121233809 is an apocalyptic number.

It is an amenable number.

121233809 is a deficient number, since it is larger than the sum of its proper divisors (1).

121233809 is an equidigital number, since it uses as much as digits as its factorization.

121233809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 121233809 is about 11010.6225527896. The cubic root of 121233809 is about 494.9271177939.

The spelling of 121233809 in words is "one hundred twenty-one million, two hundred thirty-three thousand, eight hundred nine".