121606560 has 72 divisors (see below), whose sum is σ = 414987300. Its totient is φ = 32428032.

The previous prime is 121606553. The next prime is 121606567. The reversal of 121606560 is 65606121.

It is a happy number.

121606560 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 0 + 656 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (121606553) and next prime (121606567).

It can be written as a sum of positive squares in 2 ways, for example, as 109244304 + 12362256 = 10452^2 + 3516^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (121606567) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40785 + ... + 43664.

Almost surely, 2^121606560 is an apocalyptic number.

121606560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121606560 is an abundant number, since it is smaller than the sum of its proper divisors (293380740).

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

121606560 is a wasteful number, since it uses less digits than its factorization.

121606560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84470 (or 84459 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 121606560 is about 11027.5364429232. The cubic root of 121606560 is about 495.4338406490.

The spelling of 121606560 in words is "one hundred twenty-one million, six hundred six thousand, five hundred sixty".