121564805 has 8 divisors (see below), whose sum is σ = 147724800. Its totient is φ = 96020496.

The previous prime is 121564801. The next prime is 121564819. The reversal of 121564805 is 508465121.

121564805 = T₄₆₆ + T₄₆₇ + ... + T₉₃₉.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121564805 - 2² = 121564801 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121564801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153485 + ... + 154274.

It is an arithmetic number, because the mean of its divisors is an integer number (18465600).

Almost surely, 2^121564805 is an apocalyptic number.

It is an amenable number.

121564805 is a deficient number, since it is larger than the sum of its proper divisors (26159995).

121564805 is an equidigital number, since it uses as much as digits as its factorization.

121564805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307843.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 121564805 is about 11025.6430651459. The cubic root of 121564805 is about 495.3771298702.

It can be divided in two parts, 12156 and 4805, that added together give a palindrome (16961).

The spelling of 121564805 in words is "one hundred twenty-one million, five hundred sixty-four thousand, eight hundred five".