121447505 has 16 divisors (see below), whose sum is σ = 154843920. Its totient is φ = 91268352.

The previous prime is 121447499. The next prime is 121447517. The reversal of 121447505 is 505744121.

It can be written as a sum of positive squares in 8 ways, for example, as 271441 + 121176064 = 521^2 + 11008^2 .

It is a cyclic number.

It is not a de Polignac number, because 121447505 - 2⁴ = 121447489 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5954 + ... + 16683.

It is an arithmetic number, because the mean of its divisors is an integer number (9677745).

Almost surely, 2^121447505 is an apocalyptic number.

It is an amenable number.

121447505 is a deficient number, since it is larger than the sum of its proper divisors (33396415).

121447505 is a wasteful number, since it uses less digits than its factorization.

121447505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22708.

The product of its (nonzero) digits is 5600, while the sum is 29.

The square root of 121447505 is about 11020.3223637061. The cubic root of 121447505 is about 495.2177459184.

The spelling of 121447505 in words is "one hundred twenty-one million, four hundred forty-seven thousand, five hundred five".