121182561 has 40 divisors (see below), whose sum is σ = 195497280. Its totient is φ = 74577888.

The previous prime is 121182559. The next prime is 121182569. The reversal of 121182561 is 165281121.

121182561 is a `hidden beast` number, since 1 + 21 + 1 + 82 + 561 = 666.

It is not a de Polignac number, because 121182561 - 2¹ = 121182559 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (121182569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 52906 + ... + 55148.

It is an arithmetic number, because the mean of its divisors is an integer number (4887432).

Almost surely, 2^121182561 is an apocalyptic number.

It is an amenable number.

121182561 is a deficient number, since it is larger than the sum of its proper divisors (74314719).

121182561 is a wasteful number, since it uses less digits than its factorization.

121182561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2307 (or 2298 counting only the distinct ones).

The product of its digits is 960, while the sum is 27.

The square root of 121182561 is about 11008.2950996056. The cubic root of 121182561 is about 494.8573693743.

The spelling of 121182561 in words is "one hundred twenty-one million, one hundred eighty-two thousand, five hundred sixty-one".