121125565 has 32 divisors (see below), whose sum is σ = 163560960. Its totient is φ = 85363200.

The previous prime is 121125553. The next prime is 121125569. The reversal of 121125565 is 565521121.

It is not a de Polignac number, because 121125565 - 2¹⁷ = 120994493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121125569) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 264817 + ... + 265273.

It is an arithmetic number, because the mean of its divisors is an integer number (5111280).

Almost surely, 2^121125565 is an apocalyptic number.

It is an amenable number.

121125565 is a deficient number, since it is larger than the sum of its proper divisors (42435395).

121125565 is a wasteful number, since it uses less digits than its factorization.

121125565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613.

The product of its digits is 3000, while the sum is 28.

The square root of 121125565 is about 11005.7060200607. The cubic root of 121125565 is about 494.7797748386.

Adding to 121125565 its reverse (565521121), we get a palindrome (686646686).

The spelling of 121125565 in words is "one hundred twenty-one million, one hundred twenty-five thousand, five hundred sixty-five".