121652565 has 16 divisors (see below), whose sum is σ = 194832000. Its totient is φ = 64818752.

The previous prime is 121652563. The next prime is 121652569. The reversal of 121652565 is 565256121.

It is a cyclic number.

It is not a de Polignac number, because 121652565 - 2¹ = 121652563 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121652563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15136 + ... + 21734.

It is an arithmetic number, because the mean of its divisors is an integer number (12177000).

Almost surely, 2^121652565 is an apocalyptic number.

121652565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121652565 is a deficient number, since it is larger than the sum of its proper divisors (73179435).

121652565 is a wasteful number, since it uses less digits than its factorization.

121652565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7836.

The product of its digits is 18000, while the sum is 33.

The square root of 121652565 is about 11029.6221603462. The cubic root of 121652565 is about 495.4963086612.

The spelling of 121652565 in words is "one hundred twenty-one million, six hundred fifty-two thousand, five hundred sixty-five".