121583509 has 4 divisors (see below), whose sum is σ = 121689216. Its totient is φ = 121477804.

The previous prime is 121583503. The next prime is 121583521. The reversal of 121583509 is 905385121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 905385121 = 22709 ⋅39869.

It is a cyclic number.

It is not a de Polignac number, because 121583509 - 2⁷ = 121583381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121583503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51109 + ... + 53434.

It is an arithmetic number, because the mean of its divisors is an integer number (30422304).

Almost surely, 2^121583509 is an apocalyptic number.

It is an amenable number.

121583509 is a deficient number, since it is larger than the sum of its proper divisors (105707).

121583509 is a wasteful number, since it uses less digits than its factorization.

121583509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105706.

The product of its (nonzero) digits is 10800, while the sum is 34.

The square root of 121583509 is about 11026.4912370164. The cubic root of 121583509 is about 495.4025348622.

The spelling of 121583509 in words is "one hundred twenty-one million, five hundred eighty-three thousand, five hundred nine".