121505489 has 4 divisors (see below), whose sum is σ = 138863424. Its totient is φ = 104147556.

The previous prime is 121505479. The next prime is 121505491. The reversal of 121505489 is 984505121.

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 121505489 - 2²⁰ = 120456913 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121505479) 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, 8678957 + ... + 8678970.

It is an arithmetic number, because the mean of its divisors is an integer number (34715856).

Almost surely, 2^121505489 is an apocalyptic number.

It is an amenable number.

121505489 is a deficient number, since it is larger than the sum of its proper divisors (17357935).

121505489 is an equidigital number, since it uses as much as digits as its factorization.

121505489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17357934.

The product of its (nonzero) digits is 14400, while the sum is 35.

The square root of 121505489 is about 11022.9528258085. The cubic root of 121505489 is about 495.2965457728.

The spelling of 121505489 in words is "one hundred twenty-one million, five hundred five thousand, four hundred eighty-nine".