121536645 has 16 divisors (see below), whose sum is σ = 194776512. Its totient is φ = 64713600.

The previous prime is 121536641. The next prime is 121536661. The reversal of 121536645 is 546635121.

It is not a de Polignac number, because 121536645 - 2² = 121536641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121536641) 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, 3345 + ... + 15945.

It is an arithmetic number, because the mean of its divisors is an integer number (12173532).

Almost surely, 2^121536645 is an apocalyptic number.

121536645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121536645 is a deficient number, since it is larger than the sum of its proper divisors (73239867).

121536645 is a wasteful number, since it uses less digits than its factorization.

121536645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13252.

The product of its digits is 21600, while the sum is 33.

The square root of 121536645 is about 11024.3659681634. The cubic root of 121536645 is about 495.3388762072.

The spelling of 121536645 in words is "one hundred twenty-one million, five hundred thirty-six thousand, six hundred forty-five".