121807769 has 2 divisors, whose sum is σ = 121807770. Its totient is φ = 121807768.

The previous prime is 121807759. The next prime is 121807787. The reversal of 121807769 is 967708121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67240000 + 54567769 = 8200^2 + 7387^2 .

It is a cyclic number.

It is not a de Polignac number, because 121807769 - 2⁴ = 121807753 is a prime.

It is a super-2 number, since 2×121807769² = 29674265177514722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121807709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60903884 + 60903885.

It is an arithmetic number, because the mean of its divisors is an integer number (60903885).

Almost surely, 2^121807769 is an apocalyptic number.

It is an amenable number.

121807769 is a deficient number, since it is larger than the sum of its proper divisors (1).

121807769 is an equidigital number, since it uses as much as digits as its factorization.

121807769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 41.

The square root of 121807769 is about 11036.6556981723. The cubic root of 121807769 is about 495.7069367123.

The spelling of 121807769 in words is "one hundred twenty-one million, eight hundred seven thousand, seven hundred sixty-nine".