121786857 has 6 divisors (see below), whose sum is σ = 175914362. Its totient is φ = 81191232.

The previous prime is 121786837. The next prime is 121786859. The reversal of 121786857 is 758687121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 100220121 + 21566736 = 10011^2 + 4644^2 .

It is not a de Polignac number, because 121786857 - 2⁸ = 121786601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121786859) 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 in 5 ways as a sum of consecutive naturals, for example, 6765928 + ... + 6765945.

Almost surely, 2^121786857 is an apocalyptic number.

It is an amenable number.

121786857 is a deficient number, since it is larger than the sum of its proper divisors (54127505).

121786857 is a wasteful number, since it uses less digits than its factorization.

121786857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13531879 (or 13531876 counting only the distinct ones).

The product of its digits is 188160, while the sum is 45.

The square root of 121786857 is about 11035.7082690691. The cubic root of 121786857 is about 495.6785673759.

The spelling of 121786857 in words is "one hundred twenty-one million, seven hundred eighty-six thousand, eight hundred fifty-seven".