121565564 has 12 divisors (see below), whose sum is σ = 220075800. Its totient is φ = 58686768.

The previous prime is 121565527. The next prime is 121565567. The reversal of 121565564 is 465565121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121565567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 523874 + ... + 524105.

It is an arithmetic number, because the mean of its divisors is an integer number (18339650).

Almost surely, 2^121565564 is an apocalyptic number.

It is an amenable number.

121565564 is a deficient number, since it is larger than the sum of its proper divisors (98510236).

121565564 is a wasteful number, since it uses less digits than its factorization.

121565564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1048012 (or 1048010 counting only the distinct ones).

The product of its digits is 36000, while the sum is 35.

The square root of 121565564 is about 11025.6774848533. The cubic root of 121565564 is about 495.3781608442.

The spelling of 121565564 in words is "one hundred twenty-one million, five hundred sixty-five thousand, five hundred sixty-four".