121161656 has 48 divisors (see below), whose sum is σ = 285396720. Its totient is φ = 47203200.

The previous prime is 121161647. The next prime is 121161697. The reversal of 121161656 is 656161121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2165 + ... + 15716.

It is an arithmetic number, because the mean of its divisors is an integer number (5945765).

Almost surely, 2^121161656 is an apocalyptic number.

It is an amenable number.

121161656 is an abundant number, since it is smaller than the sum of its proper divisors (164235064).

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

121161656 is a wasteful number, since it uses less digits than its factorization.

121161656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17916 (or 17901 counting only the distinct ones).

The product of its digits is 2160, while the sum is 29.

The square root of 121161656 is about 11007.3455474061. The cubic root of 121161656 is about 494.8289120667.

The spelling of 121161656 in words is "one hundred twenty-one million, one hundred sixty-one thousand, six hundred fifty-six".