121816449 has 12 divisors (see below), whose sum is σ = 176162896. Its totient is φ = 81115992.

The previous prime is 121816447. The next prime is 121816459. The reversal of 121816449 is 944618121.

121816449 is a `hidden beast` number, since 1 + 2 + 1 + 8 + 1 + 644 + 9 = 666.

It is not a de Polignac number, because 121816449 - 2¹ = 121816447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121816447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 702 + ... + 15624.

Almost surely, 2^121816449 is an apocalyptic number.

It is an amenable number.

121816449 is a deficient number, since it is larger than the sum of its proper divisors (54346447).

121816449 is a wasteful number, since it uses less digits than its factorization.

121816449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15836 (or 15833 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 121816449 is about 11037.0489262302. The cubic root of 121816449 is about 495.7187110954.

It can be divided in two parts, 121816 and 449, that added together give a triangular number (122265 = T₄₉₄).

The spelling of 121816449 in words is "one hundred twenty-one million, eight hundred sixteen thousand, four hundred forty-nine".