121086779 has 16 divisors (see below), whose sum is σ = 135320544. Its totient is φ = 107424000.

The previous prime is 121086731. The next prime is 121086799. The reversal of 121086779 is 977680121.

It is a cyclic number.

It is not a de Polignac number, because 121086779 - 2²⁰ = 120038203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121086799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80357 + ... + 81849.

It is an arithmetic number, because the mean of its divisors is an integer number (8457534).

Almost surely, 2^121086779 is an apocalyptic number.

121086779 is a deficient number, since it is larger than the sum of its proper divisors (14233765).

121086779 is a wasteful number, since it uses less digits than its factorization.

121086779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1678.

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

The square root of 121086779 is about 11003.9437930226. The cubic root of 121086779 is about 494.7269575354.

The spelling of 121086779 in words is "one hundred twenty-one million, eighty-six thousand, seven hundred seventy-nine".