121685564 has 48 divisors (see below), whose sum is σ = 285927936. Its totient is φ = 43761600.

The previous prime is 121685549. The next prime is 121685567. The reversal of 121685564 is 465586121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121685567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11192 + ... + 19199.

It is an arithmetic number, because the mean of its divisors is an integer number (5956832).

Almost surely, 2^121685564 is an apocalyptic number.

121685564 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

121685564 is an abundant number, since it is smaller than the sum of its proper divisors (164242372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121685564 is a wasteful number, since it uses less digits than its factorization.

121685564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30426 (or 30424 counting only the distinct ones).

The product of its digits is 57600, while the sum is 38.

The square root of 121685564 is about 11031.1179850458. The cubic root of 121685564 is about 495.5411067425.

The spelling of 121685564 in words is "one hundred twenty-one million, six hundred eighty-five thousand, five hundred sixty-four".