121616786 has 4 divisors (see below), whose sum is σ = 182425182. Its totient is φ = 60808392.

The previous prime is 121616773. The next prime is 121616797. The reversal of 121616786 is 687616121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 687616121 = 3697 ⋅185993.

It can be written as a sum of positive squares in only one way, i.e., 98624761 + 22992025 = 9931^2 + 4795^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 30404195 + ... + 30404198.

Almost surely, 2^121616786 is an apocalyptic number.

121616786 is a deficient number, since it is larger than the sum of its proper divisors (60808396).

121616786 is an equidigital number, since it uses as much as digits as its factorization.

121616786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60808395.

The product of its digits is 24192, while the sum is 38.

The square root of 121616786 is about 11028.0000906783. Note that the first 4 decimals coincide. The cubic root of 121616786 is about 495.4477274120.

The spelling of 121616786 in words is "one hundred twenty-one million, six hundred sixteen thousand, seven hundred eighty-six".