121871656 has 16 divisors (see below), whose sum is σ = 232256340. Its totient is φ = 59936640.

The previous prime is 121871591. The next prime is 121871663. The reversal of 121871656 is 656178121.

It can be written as a sum of positive squares in 2 ways, for example, as 121749156 + 122500 = 11034^2 + 350^2 .

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 3 ways as a sum of consecutive naturals, for example, 124381 + ... + 125356.

Almost surely, 2^121871656 is an apocalyptic number.

It is an amenable number.

121871656 is a deficient number, since it is larger than the sum of its proper divisors (110384684).

121871656 is a wasteful number, since it uses less digits than its factorization.

121871656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249804 (or 249800 counting only the distinct ones).

The product of its digits is 20160, while the sum is 37.

The square root of 121871656 is about 11039.5496284948. The cubic root of 121871656 is about 495.7935860676.

The spelling of 121871656 in words is "one hundred twenty-one million, eight hundred seventy-one thousand, six hundred fifty-six".