121564545 has 16 divisors (see below), whose sum is σ = 202960512. Its totient is φ = 62015360.

The previous prime is 121564543. The next prime is 121564577. The reversal of 121564545 is 545465121.

It is not a de Polignac number, because 121564545 - 2¹ = 121564543 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (121564543) 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, 175836 + ... + 176525.

It is an arithmetic number, because the mean of its divisors is an integer number (12685032).

Almost surely, 2^121564545 is an apocalyptic number.

121564545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121564545 is a deficient number, since it is larger than the sum of its proper divisors (81395967).

121564545 is a wasteful number, since it uses less digits than its factorization.

121564545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352392.

The product of its digits is 24000, while the sum is 33.

The square root of 121564545 is about 11025.6312744441. The cubic root of 121564545 is about 495.3767767029.

The spelling of 121564545 in words is "one hundred twenty-one million, five hundred sixty-four thousand, five hundred forty-five".