121500609 has 4 divisors (see below), whose sum is σ = 162000816. Its totient is φ = 81000404.

The previous prime is 121500607. The next prime is 121500619. The reversal of 121500609 is 906005121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121500609 - 2¹ = 121500607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121500601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20250099 + ... + 20250104.

It is an arithmetic number, because the mean of its divisors is an integer number (40500204).

Almost surely, 2^121500609 is an apocalyptic number.

It is an amenable number.

121500609 is a deficient number, since it is larger than the sum of its proper divisors (40500207).

121500609 is an equidigital number, since it uses as much as digits as its factorization.

121500609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40500206.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 121500609 is about 11022.7314672907. The cubic root of 121500609 is about 495.2899148529.

The spelling of 121500609 in words is "one hundred twenty-one million, five hundred thousand, six hundred nine".