121685777 has 2 divisors, whose sum is σ = 121685778. Its totient is φ = 121685776.

The previous prime is 121685741. The next prime is 121685783. The reversal of 121685777 is 777586121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80263681 + 41422096 = 8959^2 + 6436^2 .

It is a cyclic number.

It is not a de Polignac number, because 121685777 - 2²⁰ = 120637201 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121685737) 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, 60842888 + 60842889.

It is an arithmetic number, because the mean of its divisors is an integer number (60842889).

Almost surely, 2^121685777 is an apocalyptic number.

It is an amenable number.

121685777 is a deficient number, since it is larger than the sum of its proper divisors (1).

121685777 is an equidigital number, since it uses as much as digits as its factorization.

121685777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 164640, while the sum is 44.

The square root of 121685777 is about 11031.1276395480. The cubic root of 121685777 is about 495.5413958762.

The spelling of 121685777 in words is "one hundred twenty-one million, six hundred eighty-five thousand, seven hundred seventy-seven".