121560381 has 12 divisors (see below), whose sum is σ = 177810880. Its totient is φ = 80013960.

The previous prime is 121560379. The next prime is 121560391. The reversal of 121560381 is 183065121.

121560381 is a `hidden beast` number, since 1 + 21 + 560 + 3 + 81 = 666.

It is not a de Polignac number, because 121560381 - 2¹ = 121560379 is a prime.

It is a super-2 number, since 2×121560381² = 29553852457730322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121560391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84775 + ... + 86196.

Almost surely, 2^121560381 is an apocalyptic number.

It is an amenable number.

121560381 is a deficient number, since it is larger than the sum of its proper divisors (56250499).

121560381 is a wasteful number, since it uses less digits than its factorization.

121560381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171056 (or 171053 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 121560381 is about 11025.4424401019. The cubic root of 121560381 is about 495.3711205240.

The spelling of 121560381 in words is "one hundred twenty-one million, five hundred sixty thousand, three hundred eighty-one".