121800845 has 4 divisors (see below), whose sum is σ = 146161020. Its totient is φ = 97440672.

The previous prime is 121800827. The next prime is 121800859. The reversal of 121800845 is 548008121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39100009 + 82700836 = 6253^2 + 9094^2 .

It is a cyclic number.

It is not a de Polignac number, because 121800845 - 2¹⁶ = 121735309 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 12180080 + ... + 12180089.

It is an arithmetic number, because the mean of its divisors is an integer number (36540255).

Almost surely, 2^121800845 is an apocalyptic number.

It is an amenable number.

121800845 is a deficient number, since it is larger than the sum of its proper divisors (24360175).

121800845 is an equidigital number, since it uses as much as digits as its factorization.

121800845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24360174.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 121800845 is about 11036.3420117356. The cubic root of 121800845 is about 495.6975439347.

Adding to 121800845 its reverse (548008121), we get a palindrome (669808966).

The spelling of 121800845 in words is "one hundred twenty-one million, eight hundred thousand, eight hundred forty-five".