121563601 has 8 divisors (see below), whose sum is σ = 123042920. Its totient is φ = 120089088.

The previous prime is 121563599. The next prime is 121563683. The reversal of 121563601 is 106365121.

It can be written as a sum of positive squares in 4 ways, for example, as 10240000 + 111323601 = 3200^2 + 10551^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121563601 - 2¹ = 121563599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121560601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84355 + ... + 85783.

It is an arithmetic number, because the mean of its divisors is an integer number (15380365).

Almost surely, 2^121563601 is an apocalyptic number.

It is an amenable number.

121563601 is a deficient number, since it is larger than the sum of its proper divisors (1479319).

121563601 is an equidigital number, since it uses as much as digits as its factorization.

121563601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2403.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 121563601 is about 11025.5884650208. The cubic root of 121563601 is about 495.3754944297.

The spelling of 121563601 in words is "one hundred twenty-one million, five hundred sixty-three thousand, six hundred one".