121281656 has 8 divisors (see below), whose sum is σ = 227403120. Its totient is φ = 60640824.

The previous prime is 121281637. The next prime is 121281659. The reversal of 121281656 is 656182121.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121281659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7580096 + ... + 7580111.

It is an arithmetic number, because the mean of its divisors is an integer number (28425390).

Almost surely, 2^121281656 is an apocalyptic number.

It is an amenable number.

121281656 is a deficient number, since it is larger than the sum of its proper divisors (106121464).

121281656 is a wasteful number, since it uses less digits than its factorization.

121281656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15160213 (or 15160209 counting only the distinct ones).

The product of its digits is 5760, while the sum is 32.

The square root of 121281656 is about 11012.7951038780. The cubic root of 121281656 is about 494.9922197192.

The spelling of 121281656 in words is "one hundred twenty-one million, two hundred eighty-one thousand, six hundred fifty-six".