121806869 has 2 divisors, whose sum is σ = 121806870. Its totient is φ = 121806868.

The previous prime is 121806847. The next prime is 121806889. The reversal of 121806869 is 968608121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102111025 + 19695844 = 10105^2 + 4438^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121806869 is a prime.

It is a super-2 number, since 2×121806869² = 29673826671166322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121806829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60903434 + 60903435.

It is an arithmetic number, because the mean of its divisors is an integer number (60903435).

Almost surely, 2^121806869 is an apocalyptic number.

It is an amenable number.

121806869 is a deficient number, since it is larger than the sum of its proper divisors (1).

121806869 is an equidigital number, since it uses as much as digits as its factorization.

121806869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 121806869 is about 11036.6149248762. The cubic root of 121806869 is about 495.7057158342.

The spelling of 121806869 in words is "one hundred twenty-one million, eight hundred six thousand, eight hundred sixty-nine".