121541665 has 8 divisors (see below), whose sum is σ = 166685760. Its totient is φ = 83342832.

The previous prime is 121541659. The next prime is 121541699. The reversal of 121541665 is 566145121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121541665 - 2³ = 121541657 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1736275 + ... + 1736344.

It is an arithmetic number, because the mean of its divisors is an integer number (20835720).

Almost surely, 2^121541665 is an apocalyptic number.

It is an amenable number.

121541665 is a deficient number, since it is larger than the sum of its proper divisors (45144095).

121541665 is an equidigital number, since it uses as much as digits as its factorization.

121541665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3472631.

The product of its digits is 7200, while the sum is 31.

The square root of 121541665 is about 11024.5936433050. The cubic root of 121541665 is about 495.3456960075.

Adding to 121541665 its reverse (566145121), we get a palindrome (687686786).

The spelling of 121541665 in words is "one hundred twenty-one million, five hundred forty-one thousand, six hundred sixty-five".