121975866 has 24 divisors (see below), whose sum is σ = 264700020. Its totient is φ = 40594176.

The previous prime is 121975853. The next prime is 121975873. The reversal of 121975866 is 668579121.

It can be written as a sum of positive squares in 2 ways, for example, as 116316225 + 5659641 = 10785^2 + 2379^2 .

It is a super-2 number, since 2×121975866² = 29756223772899912, which contains 22 as substring.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 7080 + ... + 17148.

Almost surely, 2^121975866 is an apocalyptic number.

121975866 is an abundant number, since it is smaller than the sum of its proper divisors (142724154).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121975866 is a wasteful number, since it uses less digits than its factorization.

121975866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10750 (or 10747 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 121975866 is about 11044.2684683052. The cubic root of 121975866 is about 495.9348601804.

The spelling of 121975866 in words is "one hundred twenty-one million, nine hundred seventy-five thousand, eight hundred sixty-six".